add o3tl::span ctor from std::vector

Makes code simpler, and std::span can be constructed from std::vector
too.

Change-Id: Iae26b53c52148c19d9068a63126a7393d098d654
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/124507
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
Tested-by: Jenkins

1 files changed, 5 insertions, 0 deletions

diff --git a/include/o3tl/span.hxx b/include/o3tl/span.hxx
index 087d1f9d69c3..cfe4c1ffa3a3 100644
--- a/include/o3tl/span.hxx
+++ b/include/o3tl/span.hxx
@@ -26,6 +26,7 @@ namespace o3tl { using std::span; }
 #include <cstddef>
 #include <iterator>
 #include <type_traits>
+#include <vector>
 
 namespace o3tl {
 
@@ -58,6 +59,10 @@ public:
         assert(a != nullptr || len == 0);
     }
 
+    template<typename T2>
+    constexpr span(const std::vector<T2>& vec)
+        : data_(vec.data()), size_(vec.size()) {}
+
     /** for assigning from span<T> to span<const T> */
     constexpr span (const span<typename std::remove_const<T>::type>& other) noexcept
         : data_(other.data()), size_(other.size()) {}