Drop o3tl/string_view.hxx

...now that all of its uses have been replaced with C++17 <string_view>.

The LO-specific o3tl::basic_string_view ctors with OString and OUString params
have meanwhile been replaced with OString and OUString conversion functions (in
dac7be50cff94e0c34cdca5ac7e35c19685c40c1 "o3tl::string_view -> std::string_view
(in configmgr)"), the ctor with OUStringLiteral turned out to be no longer(?)
needed anyway, and the LO-specific o3tl::toOUString has meanwhile been replaced
with an OUString ctor with std::u16string_view param (in
6856da30665705be6380e84cf55de954c41f15d1 "o3tl::string_view -> std::string_view
(in embedserv)").

Change-Id: Ie5215b07e2387560fb7e94de8b5a963241539c64
Reviewed-on: https://gerrit.libreoffice.org/66144
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

5 files changed, 0 insertions, 1033 deletions

diff --git a/compilerplugins/clang/convertlong.cxx b/compilerplugins/clang/convertlong.cxx
index 593265e652de..07ec9e38a7e9 100644
--- a/compilerplugins/clang/convertlong.cxx
+++ b/compilerplugins/clang/convertlong.cxx
@@ -77,8 +77,6 @@ bool ConvertLong::VisitVarDecl(VarDecl const* varDecl)
         return true;
     if (loplugin::isSamePathname(fileName, SRCDIR "/include/tools/solar.h"))
         return true;
-    if (loplugin::isSamePathname(fileName, SRCDIR "/include/o3tl/string_view.hxx"))
-        return true;
     if (!varDecl->hasInit())
         return true;
     if (isa<IntegerLiteral>(varDecl->getInit()->IgnoreParenImpCasts()))
diff --git a/include/o3tl/string_view.hxx b/include/o3tl/string_view.hxx
deleted file mode 100644
index 2bc182034342..000000000000
--- a/include/o3tl/string_view.hxx
+++ /dev/null
@@ -1,808 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
-/*
- * This file is part of the LibreOffice project.
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- */
-
-#ifndef INCLUDED_O3TL_STRING_VIEW_HXX
-#define INCLUDED_O3TL_STRING_VIEW_HXX
-
-#include <sal/config.h>
-
-#include <algorithm>
-#include <cstddef>
-#include <ios>
-#include <iterator>
-#include <ostream>
-#include <stdexcept>
-#include <string>
-#include <type_traits>
-#include <utility>
-
-#include <rtl/string.hxx>
-#include <rtl/ustring.hxx>
-#include <sal/types.h>
-
-// An approximation of C++17 <string_view>, including implicit conversion
-// from OString and OUString.
-
-namespace o3tl {
-
-namespace detail {
-
-template<typename T> struct CharPtrDetector {
-    static constexpr bool ok = false;
-};
-
-template<> struct CharPtrDetector<char *> {
-    static constexpr bool ok = true;
-};
-
-template<> struct CharPtrDetector<char const *> {
-    static constexpr bool ok = true;
-};
-
-template<typename T> struct NonConstCharArrayDetector {
-    static constexpr bool ok = false;
-};
-
-template<std::size_t N> struct NonConstCharArrayDetector<char [N]> {
-    static constexpr bool ok = true;
-};
-
-template<typename T> struct ConstCharArrayDetector {
-    static constexpr bool ok = false;
-};
-
-template<std::size_t N> struct ConstCharArrayDetector<char const[N]> {
-    static constexpr bool ok = true;
-    static constexpr std::size_t length = N - 1;
-};
-
-template<typename T> struct Char16PtrDetector {
-    static constexpr bool ok = false;
-};
-
-template<> struct Char16PtrDetector<char16_t *> {
-    static constexpr bool ok = true;
-};
-
-template<> struct Char16PtrDetector<char16_t const *> {
-    static constexpr bool ok = true;
-};
-
-template<typename T> struct NonConstChar16ArrayDetector {
-    static constexpr bool ok = false;
-};
-
-template<std::size_t N> struct NonConstChar16ArrayDetector<char16_t [N]> {
-    static constexpr bool ok = true;
-};
-
-template<typename T> struct ConstChar16ArrayDetector {
-    static constexpr bool ok = false;
-};
-
-template<std::size_t N> struct ConstChar16ArrayDetector<char16_t const[N]> {
-    static constexpr bool ok = true;
-    static constexpr std::size_t length = N - 1;
-};
-
-template<typename T> struct Char32PtrDetector {
-    static constexpr bool ok = false;
-};
-
-template<> struct Char32PtrDetector<char32_t *> {
-    static constexpr bool ok = true;
-};
-
-template<> struct Char32PtrDetector<char32_t const *> {
-    static constexpr bool ok = true;
-};
-
-template<typename T> struct NonConstChar32ArrayDetector {
-    static constexpr bool ok = false;
-};
-
-template<std::size_t N> struct NonConstChar32ArrayDetector<char32_t [N]> {
-    static constexpr bool ok = true;
-};
-
-template<typename T> struct ConstChar32ArrayDetector {
-    static constexpr bool ok = false;
-};
-
-template<std::size_t N> struct ConstChar32ArrayDetector<char32_t const[N]> {
-    static constexpr bool ok = true;
-    static constexpr std::size_t length = N - 1;
-};
-
-template<typename T> struct WcharPtrDetector {
-    static constexpr bool ok = false;
-};
-
-template<> struct WcharPtrDetector<wchar_t *> {
-    static constexpr bool ok = true;
-};
-
-template<> struct WcharPtrDetector<wchar_t const *> {
-    static constexpr bool ok = true;
-};
-
-template<typename T> struct NonConstWcharArrayDetector {
-    static constexpr bool ok = false;
-};
-
-template<std::size_t N> struct NonConstWcharArrayDetector<wchar_t [N]> {
-    static constexpr bool ok = true;
-};
-
-template<typename T> struct ConstWcharArrayDetector {
-    static constexpr bool ok = false;
-};
-
-template<std::size_t N> struct ConstWcharArrayDetector<wchar_t const[N]> {
-    static constexpr bool ok = true;
-    static constexpr std::size_t length = N - 1;
-};
-
-}
-
-template<typename charT, typename traits = std::char_traits<charT>>
-class basic_string_view {
-public:
-    using traits_type = traits;
-    using value_type = charT;
-    using pointer = value_type *;
-    using const_pointer = value_type const *;
-    using reference = value_type &;
-    using const_reference = value_type const &;
-    using const_iterator = const_pointer;
-    using iterator = const_iterator;
-    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
-    using reverse_iterator = const_reverse_iterator;
-    using size_type = std::size_t;
-    using difference_type = std::ptrdiff_t;
-
-    static constexpr size_type npos = size_type(-1);
-
-    constexpr basic_string_view() noexcept: data_(nullptr), size_(0) {}
-
-    constexpr basic_string_view(basic_string_view const &) noexcept = default;
-
-    constexpr basic_string_view & operator =(basic_string_view const & other) noexcept = default;
-
-    // The various character types are handled below in the "LO specifics, to
-    // make up for traits::length not necessarily being constexpr yet for
-    // literal arguments" section:
-    template<typename T = charT> constexpr basic_string_view(
-        charT const * str,
-        typename std::enable_if<
-            !(std::is_same<T, char>::value || std::is_same<T, char16_t>::value
-              || std::is_same<T, char32_t>::value
-              || std::is_same<T, wchar_t>::value),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(str), size_(traits::length(str)) {}
-
-    constexpr basic_string_view(charT const * str, size_type len):
-        data_(str), size_(len) {}
-
-    constexpr const_iterator begin() const noexcept { return data_; }
-
-    constexpr const_iterator end() const noexcept { return begin() + size(); }
-
-    constexpr const_iterator cbegin() const noexcept { return begin(); }
-
-    constexpr const_iterator cend() const noexcept { return end(); }
-
-    constexpr const_reverse_iterator rbegin() const noexcept
-    { return const_reverse_iterator(end()); }
-
-    constexpr const_reverse_iterator rend() const noexcept
-    { return const_reverse_iterator(begin()); }
-
-    constexpr const_reverse_iterator crbegin() const noexcept
-    { return rbegin(); }
-
-    constexpr const_reverse_iterator crend() const noexcept { return rend(); }
-
-    constexpr size_type size() const noexcept { return size_; }
-
-    constexpr size_type length() const noexcept { return size(); }
-
-    constexpr size_type max_size() const noexcept {
-        (void) this; // silence loplugin:staticmethods
-        return npos - 1;
-    }
-
-    constexpr bool empty() const noexcept { return size_ == 0; }
-
-    constexpr const_reference operator [](size_type pos) const {
-        assert(pos < size());
-        return data_[pos];
-    }
-
-    constexpr const_reference at(size_type pos) const {
-        if (pos >= size()) {
-            throw std::out_of_range("o3tl::basic_string_view::at");
-        }
-        return operator [](pos);
-    }
-
-    constexpr const_reference front() const {
-        assert(!empty());
-        return operator [](0);
-    }
-
-    constexpr const_reference back() const {
-        assert(!empty());
-        return operator [](size() - 1);
-    }
-
-    constexpr const_pointer data() const noexcept { return data_; }
-
-    constexpr void remove_prefix(size_type n) {
-        assert(n <= size());
-        data_ += n;
-        size_ -= n;
-    }
-
-    constexpr void remove_suffix(size_type n) {
-        assert(n <= size());
-        size_ -= n;
-    }
-
-    constexpr void swap(basic_string_view & s) noexcept {
-        std::swap(data_, s.data_);
-        std::swap(size_, s.size_);
-    }
-
-    size_type copy(charT * s, size_type n, size_type pos = 0) const {
-        if (pos > size()) {
-            throw std::out_of_range("o3tl::basic_string_view::copy");
-        }
-        auto rlen = std::min(n, size_type(size() - pos));
-        traits::copy(s, data() + pos, rlen);
-        return rlen;
-    }
-
-    constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const {
-        if (pos > size()) {
-            throw std::out_of_range("o3tl::basic_string_view::copy");
-        }
-        return basic_string_view(
-            data() + pos, std::min(n, size_type(size() - pos)));
-    }
-
-    constexpr int compare(basic_string_view s) const noexcept {
-        auto n = traits::compare(data(), s.data(), std::min(size(), s.size()));
-        return n == 0
-            ? (size() < s.size() ? -1 : size() == s.size() ? 0 : 1) : n;
-    }
-
-    constexpr int compare(size_type pos1, size_type n1, basic_string_view s)
-        const
-    { return substr(pos1, n1).compare(s); }
-
-    constexpr int compare(
-        size_type pos1, size_type n1, basic_string_view s, size_type pos2,
-        size_type n2) const
-    { return substr(pos1, n1).compare(s.substr(pos2, n2)); }
-
-    constexpr int compare(charT const * s) const
-    { return compare(basic_string_view(s)); }
-
-    constexpr int compare(size_type pos1, size_type n1, charT const * s) const
-    { return substr(pos1, n1).compare(s); }
-
-    constexpr int compare(
-        size_type pos1, size_type n1, charT const * s, size_type n2) const
-    { return substr(pos1, n1).compare(basic_string_view(s, n2)); }
-
-    constexpr size_type find(basic_string_view s, size_type pos = 0) const noexcept {
-        if (s.size() <= size()) {
-            for (auto xpos = pos; xpos <= size() - s.size(); ++xpos) {
-                bool match = true;
-                for (size_type i = 0; i != s.size(); ++i) {
-                    if (!traits::eq(data_[xpos + i], s.data_[i])) {
-                        match = false;
-                        break;
-                    }
-                }
-                if (match) {
-                    return xpos;
-                }
-            }
-        }
-        return npos;
-    }
-
-    constexpr size_type find(charT c, size_type pos = 0) const noexcept
-    { return find(basic_string_view(&c, 1), pos); }
-
-    constexpr size_type find(charT const * s, size_type pos, size_type n) const
-    { return find(basic_string_view(s, n), pos); }
-
-    constexpr size_type find(charT const * s, size_type pos = 0) const
-    { return find(basic_string_view(s), pos); }
-
-    constexpr size_type rfind(basic_string_view s, size_type pos = npos) const noexcept {
-        if (s.size() <= size()) {
-            for (auto xpos = std::min<size_type>(size() - s.size(), pos);;
-                 --xpos)
-            {
-                bool match = true;
-                for (size_type i = 0; i != s.size(); ++i) {
-                    if (!traits::eq(data_[xpos + i], s.data_[i])) {
-                        match = false;
-                        break;
-                    }
-                }
-                if (match) {
-                    return xpos;
-                }
-                if (xpos == 0) {
-                    break;
-                }
-            }
-        }
-        return npos;
-    }
-
-    constexpr size_type rfind(charT c, size_type pos = npos) const noexcept
-    { return rfind(basic_string_view(&c, 1), pos); }
-
-    constexpr size_type rfind(charT const * s, size_type pos, size_type n) const
-    { return rfind(basic_string_view(s, n), pos); }
-
-    constexpr size_type rfind(charT const * s, size_type pos = npos) const
-    { return rfind(basic_string_view(s), pos); }
-
-    constexpr size_type find_first_of(basic_string_view s, size_type pos = 0) const
-        noexcept
-    {
-        for (auto xpos = pos; xpos < size(); ++xpos) {
-            for (size_type i = 0; i != s.size(); ++i) {
-                if (traits::eq(data_[xpos], s.data_[i])) {
-                    return xpos;
-                }
-            }
-        }
-        return npos;
-    }
-
-    constexpr size_type find_first_of(charT c, size_type pos = 0) const noexcept
-    { return find_first_of(basic_string_view(&c, 1), pos); }
-
-    constexpr size_type find_first_of(
-        charT const * s, size_type pos, size_type n) const
-    { return find_first_of(basic_string_view(s, n), pos); }
-
-    constexpr size_type find_first_of(charT const * s, size_type pos = 0) const
-    { return find_first_of(basic_string_view(s), pos); }
-
-    constexpr size_type find_last_of(basic_string_view s, size_type pos = npos) const
-        noexcept
-    {
-        if (!empty()) {
-            for (auto xpos = std::min<size_type>(size() - 1, pos);; --xpos) {
-                for (size_type i = 0; i != s.size(); ++i) {
-                    if (traits::eq(data_[xpos], s.data_[i])) {
-                        return xpos;
-                    }
-                }
-                if (xpos == 0) {
-                    break;
-                }
-            }
-        }
-        return npos;
-    }
-
-    constexpr size_type find_last_of(charT c, size_type pos = npos) const
-        noexcept
-    { return find_last_of(basic_string_view(&c, 1), pos); }
-
-    constexpr size_type find_last_of(
-        charT const * s, size_type pos, size_type n) const
-    { return find_last_of(basic_string_view(s, n), pos); }
-
-    constexpr size_type find_last_of(charT const * s, size_type pos = npos)
-        const
-    { return find_last_of(basic_string_view(s), pos); }
-
-    constexpr size_type find_first_not_of(basic_string_view s, size_type pos = 0) const
-        noexcept
-    {
-        for (auto xpos = pos; xpos < size(); ++xpos) {
-            bool match = true;
-            for (size_type i = 0; i != s.size(); ++i) {
-                if (traits::eq(data_[xpos], s.data_[i])) {
-                    match = false;
-                    break;
-                }
-            }
-            if (match) {
-                return xpos;
-            }
-        }
-        return npos;
-    }
-
-    constexpr size_type find_first_not_of(charT c, size_type pos = 0) const
-        noexcept
-    { return find_first_not_of(basic_string_view(&c, 1), pos); }
-
-    constexpr size_type find_first_not_of(
-        charT const * s, size_type pos, size_type n) const
-    { return find_first_not_of(basic_string_view(s, n), pos); }
-
-    constexpr size_type find_first_not_of(charT const * s, size_type pos = 0)
-        const
-    { return find_first_not_of(basic_string_view(s), pos); }
-
-    constexpr size_type find_last_not_of(basic_string_view s, size_type pos = npos) const
-        noexcept
-    {
-        if (!empty()) {
-            for (auto xpos = std::min<size_type>(size() - 1, pos);; --xpos) {
-                bool match = true;
-                for (size_type i = 0; i != s.size(); ++i) {
-                    if (traits::eq(data_[xpos], s.data_[i])) {
-                        match = false;
-                        break;
-                    }
-                }
-                if (match) {
-                    return xpos;
-                }
-                if (xpos == 0) {
-                    break;
-                }
-            }
-        }
-        return npos;
-    }
-
-    constexpr size_type find_last_not_of(charT c, size_type pos = npos) const
-        noexcept
-    { return find_last_not_of(basic_string_view(&c, 1), pos); }
-
-    constexpr size_type find_last_not_of(
-        charT const * s, size_type pos, size_type n) const
-    { return find_last_not_of(basic_string_view(s, n), pos); }
-
-    constexpr size_type find_last_not_of(charT const * s, size_type pos = npos)
-        const
-    { return find_last_not_of(basic_string_view(s), pos); }
-
-    // LO specifics:
-
-    // For std::basic_string_view, this is provided via a non-explicit
-    // conversion operator from std::basic_string:
-    constexpr basic_string_view(std::basic_string<charT, traits> const & s):
-        data_(s.data()), size_(s.size()) {}
-
-    // For std::string_view, this will be provided by a (LIBO_INTERNAL_ONLY)
-    // non-explicit conversion operator from OString:
-    template<typename T = charT> basic_string_view(
-        OString const & s,
-        typename std::enable_if<
-            std::is_same<T, char>::value,
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(s.getStr()), size_(s.getLength()) {}
-
-    // For std::u16string_view, this will be provided by a (LIBO_INTERNAL_ONLY)
-    // non-explicit conversion operator from OUString:
-    template<typename T = charT> basic_string_view(
-        OUString const & s,
-        typename std::enable_if<
-            std::is_same<T, sal_Unicode>::value,
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(s.getStr()), size_(s.getLength()) {}
-
-    // For std::u16string_view, this would either be provided by a
-    // (LIBO_INTERNAL_ONLY) non-explicit conversion operator from
-    // OUStringLiteral, or OUStringLiteral would be given up in favor
-    // of std::u16string_view anyway (but this constructor also serves to reject
-    // as ambiguous construction of a o3tl::u16string_view from a narrow string
-    // literal, which would otherwise go via the above OUString
-    // constructor):
-    template<typename T = charT> constexpr basic_string_view(
-        OUStringLiteral literal,
-        typename std::enable_if<
-            std::is_same<T, sal_Unicode>::value,
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(literal.data), size_(literal.size) {}
-
-    // LO specifics, to make up for traits::length not necessarily being
-    // constexpr yet for literal arguments:
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 const & value,
-        typename std::enable_if<
-            std::is_same<T2, char>::value && detail::CharPtrDetector<T1>::ok,
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(value), size_(traits::length(value)) {}
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 & value,
-        typename std::enable_if<
-            (std::is_same<T2, char>::value
-             && detail::NonConstCharArrayDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(value), size_(traits::length(value)) {}
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 & literal,
-        typename std::enable_if<
-            (std::is_same<T2, char>::value
-             && detail::ConstCharArrayDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(literal), size_(detail::ConstCharArrayDetector<T1>::length)
-    { /*assert(size_ == traits::length(literal);*/ }
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 const & value,
-        typename std::enable_if<
-            (std::is_same<T2, char16_t>::value
-             && detail::Char16PtrDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(value), size_(traits::length(value)) {}
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 & value,
-        typename std::enable_if<
-            (std::is_same<T2, char16_t>::value
-             && detail::NonConstChar16ArrayDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(value), size_(traits::length(value)) {}
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 & literal,
-        typename std::enable_if<
-            (std::is_same<T2, char16_t>::value
-             && detail::ConstChar16ArrayDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(literal), size_(detail::ConstChar16ArrayDetector<T1>::length)
-    { /*assert(size_ == traits::length(literal);*/ }
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 const & value,
-        typename std::enable_if<
-            (std::is_same<T2, char32_t>::value
-             && detail::Char32PtrDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(value), size_(traits::length(value)) {}
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 & value,
-        typename std::enable_if<
-            (std::is_same<T2, char32_t>::value
-             && detail::NonConstChar32ArrayDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(value), size_(traits::length(value)) {}
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 & literal,
-        typename std::enable_if<
-            (std::is_same<T2, char32_t>::value
-             && detail::ConstChar32ArrayDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(literal), size_(detail::ConstChar32ArrayDetector<T1>::length)
-    { /*assert(size_ == traits::length(literal);*/ }
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 const & value,
-        typename std::enable_if<
-            (std::is_same<T2, wchar_t>::value
-             && detail::WcharPtrDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(value), size_(traits::length(value)) {}
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 & value,
-        typename std::enable_if<
-            (std::is_same<T2, wchar_t>::value
-             && detail::NonConstWcharArrayDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(value), size_(traits::length(value)) {}
-
-    template<typename T1, typename T2 = charT> constexpr basic_string_view(
-        T1 & literal,
-        typename std::enable_if<
-            (std::is_same<T2, wchar_t>::value
-             && detail::ConstWcharArrayDetector<T1>::ok),
-            rtl::libreoffice_internal::Dummy>::type = {}):
-        data_(literal), size_(detail::ConstWcharArrayDetector<T1>::length)
-    { /*assert(size_ == traits::length(literal);*/ }
-
-private:
-    const_pointer data_;
-    size_type size_;
-};
-
-template<class charT, class traits> constexpr bool operator ==(
-    basic_string_view<charT, traits> x, basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) == 0; }
-
-template<class charT, class traits> constexpr bool operator ==(
-    basic_string_view<charT, traits> x,
-    typename std::decay<basic_string_view<charT, traits>>::type y)
-    noexcept
-{ return x.compare(y) == 0; }
-
-template<class charT, class traits> constexpr bool operator ==(
-    typename std::decay<basic_string_view<charT, traits>>::type x,
-    basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) == 0; }
-
-template<class charT, class traits> constexpr bool operator !=(
-    basic_string_view<charT, traits> x, basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) != 0; }
-
-template<class charT, class traits> constexpr bool operator !=(
-    basic_string_view<charT, traits> x,
-    typename std::decay<basic_string_view<charT, traits>>::type y)
-    noexcept
-{ return x.compare(y) != 0; }
-
-template<class charT, class traits> constexpr bool operator !=(
-    typename std::decay<basic_string_view<charT, traits>>::type x,
-    basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) != 0; }
-
-template<class charT, class traits> constexpr bool operator <(
-    basic_string_view<charT, traits> x, basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) < 0; }
-
-template<class charT, class traits> constexpr bool operator <(
-    basic_string_view<charT, traits> x,
-    typename std::decay<basic_string_view<charT, traits>>::type y)
-    noexcept
-{ return x.compare(y) < 0; }
-
-template<class charT, class traits> constexpr bool operator <(
-    typename std::decay<basic_string_view<charT, traits>>::type x,
-    basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) < 0; }
-
-template<class charT, class traits> constexpr bool operator >(
-    basic_string_view<charT, traits> x, basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) > 0; }
-
-template<class charT, class traits> constexpr bool operator >(
-    basic_string_view<charT, traits> x,
-    typename std::decay<basic_string_view<charT, traits>>::type y)
-    noexcept
-{ return x.compare(y) > 0; }
-
-template<class charT, class traits> constexpr bool operator >(
-    typename std::decay<basic_string_view<charT, traits>>::type x,
-    basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) > 0; }
-
-template<class charT, class traits> constexpr bool operator <=(
-    basic_string_view<charT, traits> x, basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) <= 0; }
-
-template<class charT, class traits> constexpr bool operator <=(
-    basic_string_view<charT, traits> x,
-    typename std::decay<basic_string_view<charT, traits>>::type y)
-    noexcept
-{ return x.compare(y) <= 0; }
-
-template<class charT, class traits> constexpr bool operator <=(
-    typename std::decay<basic_string_view<charT, traits>>::type x,
-    basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) <= 0; }
-
-template<class charT, class traits> constexpr bool operator >=(
-    basic_string_view<charT, traits> x, basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) >= 0; }
-
-template<class charT, class traits> constexpr bool operator >=(
-    basic_string_view<charT, traits> x,
-    typename std::decay<basic_string_view<charT, traits>>::type y)
-    noexcept
-{ return x.compare(y) >= 0; }
-
-template<class charT, class traits> constexpr bool operator >=(
-    typename std::decay<basic_string_view<charT, traits>>::type x,
-    basic_string_view<charT, traits> y)
-    noexcept
-{ return x.compare(y) >= 0; }
-
-template<class charT, class traits> std::basic_ostream<charT, traits> &
-operator <<(
-    std::basic_ostream<charT, traits> & os,
-    basic_string_view<charT, traits> str)
-{
-    typename std::basic_ostream<charT, traits>::sentry sentry(os);
-    if (sentry) {
-        auto const w = os.width();
-        auto pad
-            = std::max<typename std::make_unsigned<decltype(w + str.size())>::type>(
-                  w < 0 ? 0 : w, str.size())
-              - str.size();
-        auto const after = (os.flags() & std::ios_base::adjustfield)
-            == std::ios_base::left;
-        if (pad != 0 && !after) {
-            auto const c = os.fill();
-            for (; pad != 0; --pad) {
-                os.rdbuf()->sputc(c);
-            }
-        }
-        os.rdbuf()->sputn(str.data(), str.size());
-        if (pad != 0 && after) {
-            auto const c = os.fill();
-            for (; pad != 0; --pad) {
-                os.rdbuf()->sputc(c);
-            }
-        }
-        os.width(0);
-    }
-    return os;
-}
-
-using string_view = basic_string_view<char>;
-using u16string_view = basic_string_view<char16_t>;
-using u32string_view = basic_string_view<char32_t>;
-using wstring_view = basic_string_view<wchar_t>;
-
-// no literals::string_view_literals::operator "" sv
-
-}
-
-namespace std {
-
-template<> struct hash<o3tl::string_view> {
-    std::size_t operator ()(o3tl::string_view s)
-    { return hash<string>()(string(s.data(), s.size())); }
-};
-
-template<> struct hash<o3tl::u16string_view> {
-    std::size_t operator ()(o3tl::u16string_view s)
-    { return hash<u16string>()(u16string(s.data(), s.size())); }
-};
-
-template<> struct hash<o3tl::u32string_view> {
-    std::size_t operator ()(o3tl::u32string_view s)
-    { return hash<u32string>()(u32string(s.data(), s.size())); }
-};
-
-template<> struct hash<o3tl::wstring_view> {
-    std::size_t operator ()(o3tl::wstring_view s)
-    { return hash<wstring>()(wstring(s.data(), s.size())); }
-};
-
-}
-
-namespace o3tl {
-
-// LO-specific convenience functions:
-
-// For std::u16string_view, this will be provided by a (LIBO_INTERNAL_ONLY)
-// OUString constructor:
-inline OUString toOUString(u16string_view s)
-{ return OUString(s.data(), s.size()); }
-
-}
-
-#endif
-
-/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/o3tl/CppunitTest_o3tl_tests.mk b/o3tl/CppunitTest_o3tl_tests.mk
index 9d802b98e167..1dbfebdf798a 100644
--- a/o3tl/CppunitTest_o3tl_tests.mk
+++ b/o3tl/CppunitTest_o3tl_tests.mk
@@ -33,7 +33,6 @@ $(eval $(call gb_CppunitTest_add_exception_objects,o3tl_tests,\
 	o3tl/qa/test-lru_map \
 	o3tl/qa/test-safeint \
 	o3tl/qa/test-sorted_vector \
-	o3tl/qa/test-string_view \
 	o3tl/qa/test-typed_flags \
 	o3tl/qa/test-vector_pool \
 ))
diff --git a/o3tl/qa/test-string_view.cxx b/o3tl/qa/test-string_view.cxx
deleted file mode 100644
index fb6239fca379..000000000000
--- a/o3tl/qa/test-string_view.cxx
+++ /dev/null
@@ -1,221 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
-/*
- * This file is part of the LibreOffice project.
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- */
-
-#include <sal/config.h>
-
-#include <sstream>
-#include <stdexcept>
-#include <string>
-
-#include <cppunit/TestAssert.h>
-#include <cppunit/TestFixture.h>
-#include <cppunit/extensions/HelperMacros.h>
-
-#include <o3tl/string_view.hxx>
-
-namespace {
-
-class Test: public CppUnit::TestFixture {
-private:
-    CPPUNIT_TEST_SUITE(Test);
-    CPPUNIT_TEST(testCharLiteral);
-    CPPUNIT_TEST(testChar16Literal);
-    CPPUNIT_TEST(testChar32Literal);
-    CPPUNIT_TEST(testWcharLiteral);
-    CPPUNIT_TEST(testOperations);
-    CPPUNIT_TEST(testOutput);
-    CPPUNIT_TEST_SUITE_END();
-
-    void testCharLiteral() {
-        char * const s1 = const_cast<char *>("foo");
-        o3tl::string_view v1(s1);
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(3), v1.size());
-        char const * const s2 = "foo";
-        o3tl::string_view v2(s2);
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(3), v2.size());
-        char s3[] = "foo";
-        o3tl::string_view v3(s3);
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(3), v3.size());
-        o3tl::string_view v4("foo");
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(3), v4.size());
-    }
-
-    void testChar16Literal() {
-        char16_t * const s1 = const_cast<char16_t *>(u"foo");
-        o3tl::u16string_view v1(s1);
-        CPPUNIT_ASSERT_EQUAL(o3tl::u16string_view::size_type(3), v1.size());
-        char16_t const * const s2 = u"foo";
-        o3tl::u16string_view v2(s2);
-        CPPUNIT_ASSERT_EQUAL(o3tl::u16string_view::size_type(3), v2.size());
-        char16_t s3[] = u"foo";
-        o3tl::u16string_view v3(s3);
-        CPPUNIT_ASSERT_EQUAL(o3tl::u16string_view::size_type(3), v3.size());
-        o3tl::u16string_view v4(u"foo");
-        CPPUNIT_ASSERT_EQUAL(o3tl::u16string_view::size_type(3), v4.size());
-    }
-
-    void testChar32Literal() {
-        char32_t * const s1 = const_cast<char32_t *>(U"foo");
-        o3tl::u32string_view v1(s1);
-        CPPUNIT_ASSERT_EQUAL(o3tl::u32string_view::size_type(3), v1.size());
-        char32_t const * const s2 = U"foo";
-        o3tl::u32string_view v2(s2);
-        CPPUNIT_ASSERT_EQUAL(o3tl::u32string_view::size_type(3), v2.size());
-        char32_t s3[] = U"foo";
-        o3tl::u32string_view v3(s3);
-        CPPUNIT_ASSERT_EQUAL(o3tl::u32string_view::size_type(3), v3.size());
-        o3tl::u32string_view v4(U"foo");
-        CPPUNIT_ASSERT_EQUAL(o3tl::u32string_view::size_type(3), v4.size());
-    }
-
-    void testWcharLiteral() {
-        wchar_t * const s1 = const_cast<wchar_t *>(L"foo");
-        o3tl::wstring_view v1(s1);
-        CPPUNIT_ASSERT_EQUAL(o3tl::wstring_view::size_type(3), v1.size());
-        wchar_t const * const s2 = L"foo";
-        o3tl::wstring_view v2(s2);
-        CPPUNIT_ASSERT_EQUAL(o3tl::wstring_view::size_type(3), v2.size());
-        wchar_t s3[] = L"foo";
-        o3tl::wstring_view v3(s3);
-        CPPUNIT_ASSERT_EQUAL(o3tl::wstring_view::size_type(3), v3.size());
-        o3tl::wstring_view v4(L"foo");
-        CPPUNIT_ASSERT_EQUAL(o3tl::wstring_view::size_type(3), v4.size());
-    }
-
-    void testOperations() {
-        o3tl::string_view const v("fox");
-        auto npos = o3tl::string_view::npos;
-            // o3tl::basic_string_view::npos will be (implicitly) inline with
-            // C++17, but for now can't be passed as 'const T& expected'
-            // argument into CppUnit::assertEquals, so take this detour
-        CPPUNIT_ASSERT_EQUAL('f', *v.begin());
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::difference_type(3), v.end() - v.begin());
-        CPPUNIT_ASSERT_EQUAL('f', *v.cbegin());
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::difference_type(3), v.cend() - v.cbegin());
-        CPPUNIT_ASSERT_EQUAL('x', *v.rbegin());
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::difference_type(3), v.rend() - v.rbegin());
-        CPPUNIT_ASSERT_EQUAL('x', *v.crbegin());
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::difference_type(3), v.crend() - v.crbegin());
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(3), v.size());
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(3), v.length());
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::npos - 1, v.max_size());
-        CPPUNIT_ASSERT(!v.empty());
-        CPPUNIT_ASSERT_EQUAL('o', v[1]);
-        try {
-            v.at(o3tl::string_view::npos);
-            CPPUNIT_FAIL("missing exception");
-        } catch (std::out_of_range &) {}
-        CPPUNIT_ASSERT_EQUAL('f', v.at(0));
-        CPPUNIT_ASSERT_EQUAL('x', v.at(2));
-        try {
-            v.at(3);
-            CPPUNIT_FAIL("missing exception");
-        } catch (std::out_of_range &) {}
-        CPPUNIT_ASSERT_EQUAL('f', v.front());
-        CPPUNIT_ASSERT_EQUAL('x', v.back());
-        CPPUNIT_ASSERT_EQUAL('f', *v.data());
-        {
-            o3tl::string_view v1("fox");
-            v1.remove_prefix(2);
-            CPPUNIT_ASSERT_EQUAL('x', v1.front());
-            CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(1), v1.size());
-        }
-        {
-            o3tl::string_view v1("fox");
-            v1.remove_suffix(2);
-            CPPUNIT_ASSERT_EQUAL('f', v1.front());
-            CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(1), v1.size());
-        }
-        {
-            o3tl::string_view v1("fox");
-            o3tl::string_view v2("giraffe");
-            v1.swap(v2);
-            CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(7), v1.size());
-            CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(3), v2.size());
-        }
-        {
-            char a[2];
-            auto n = v.copy(a, 10, 1);
-            CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(2), n);
-            CPPUNIT_ASSERT_EQUAL('o', a[0]);
-            CPPUNIT_ASSERT_EQUAL('x', a[1]);
-        }
-        {
-            auto v1 = v.substr(1);
-            CPPUNIT_ASSERT_EQUAL('o', v1.front());
-            CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(2), v1.size());
-        }
-        CPPUNIT_ASSERT(v.compare(o3tl::string_view("foo")) > 0);
-        CPPUNIT_ASSERT(v.compare(0, 2, o3tl::string_view("foo")) < 0);
-        CPPUNIT_ASSERT_EQUAL(
-            0, v.compare(0, 2, o3tl::string_view("foo"), 0, 2));
-        CPPUNIT_ASSERT_EQUAL(0, v.compare("fox"));
-        CPPUNIT_ASSERT(v.compare(1, 2, "abc") > 0);
-        CPPUNIT_ASSERT_EQUAL(0, v.compare(1, 2, "oxx", 2));
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(1), v.find("ox"));
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(1), v.find('o'));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find("oxx", 0, 2));
-        CPPUNIT_ASSERT_EQUAL(npos, v.find("oxx"));
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(1), v.rfind("ox"));
-        CPPUNIT_ASSERT_EQUAL(o3tl::string_view::size_type(1), v.rfind('o'));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1),
-            v.rfind("oxx", o3tl::string_view::npos, 2));
-        CPPUNIT_ASSERT_EQUAL(npos, v.rfind("oxx"));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_first_of("nop"));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_first_of('o'));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_first_of("nofx", 0, 2));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(0), v.find_first_of("nofx"));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_last_of("nop"));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_last_of('o'));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1),
-            v.find_last_of("nofx", o3tl::string_view::npos, 2));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(2), v.find_last_of("nofx"));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_first_not_of("fx"));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_first_not_of('f'));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_first_not_of("fxo", 0, 2));
-        CPPUNIT_ASSERT_EQUAL(npos, v.find_first_not_of("fxo"));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_last_not_of("fx"));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1), v.find_last_not_of('x'));
-        CPPUNIT_ASSERT_EQUAL(
-            o3tl::string_view::size_type(1),
-            v.find_last_not_of("fxo", o3tl::string_view::npos, 2));
-        CPPUNIT_ASSERT_EQUAL(npos, v.find_last_not_of("fxo"));
-    }
-
-    void testOutput() {
-        std::ostringstream s;
-        s << o3tl::string_view("foo");
-        CPPUNIT_ASSERT_EQUAL(std::string("foo"), s.str());
-    }
-};
-
-CPPUNIT_TEST_SUITE_REGISTRATION(Test);
-
-}
-
-/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/solenv/clang-format/blacklist b/solenv/clang-format/blacklist
index c86246f70eb8..0287ee50af5c 100644
--- a/solenv/clang-format/blacklist
+++ b/solenv/clang-format/blacklist
@@ -6504,7 +6504,6 @@ include/o3tl/numeric.hxx
 include/o3tl/runtimetooustring.hxx
 include/o3tl/safeint.hxx
 include/o3tl/sorted_vector.hxx
-include/o3tl/string_view.hxx
 include/o3tl/strong_int.hxx
 include/o3tl/typed_flags_set.hxx
 include/o3tl/vector_pool.hxx