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-rw-r--r--hwpfilter/source/solver.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/hwpfilter/source/solver.h b/hwpfilter/source/solver.h
index 4d2a5e3a8eb8..451ed068142a 100644
--- a/hwpfilter/source/solver.h
+++ b/hwpfilter/source/solver.h
@@ -26,7 +26,7 @@ public:
static std::unique_ptr<std::unique_ptr<double[]>[]> NewMatrix (int N);
static std::unique_ptr<double[]> NewVector (int N);
- static bool Solve (int N, std::unique_ptr<std::unique_ptr<double[]>[]>& A, double* b);
+ static bool Solve (int N, std::unique_ptr<std::unique_ptr<double[]>[]> const & A, double* b);
// Input:
// A[N][N] coefficient matrix, entries are A[row][col]
// b[N] vector, entries are b[row]