diff options
Diffstat (limited to 'libstdc++-v3/include/std/valarray')
| -rw-r--r-- | libstdc++-v3/include/std/valarray | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/libstdc++-v3/include/std/valarray b/libstdc++-v3/include/std/valarray index 5adc942..c6242eb 100644 --- a/libstdc++-v3/include/std/valarray +++ b/libstdc++-v3/include/std/valarray @@ -1210,9 +1210,10 @@ _DEFINE_BINARY_OPERATOR(>=, __greater_equal) * @param __va valarray. */ template<class _Tp> + [[__nodiscard__]] inline _Tp* - begin(valarray<_Tp>& __va) - { return std::__addressof(__va[0]); } + begin(valarray<_Tp>& __va) noexcept + { return __va.size() ? std::__addressof(__va[0]) : nullptr; } /** * @brief Return an iterator pointing to the first element of @@ -1220,9 +1221,10 @@ _DEFINE_BINARY_OPERATOR(>=, __greater_equal) * @param __va valarray. */ template<class _Tp> + [[__nodiscard__]] inline const _Tp* - begin(const valarray<_Tp>& __va) - { return std::__addressof(__va[0]); } + begin(const valarray<_Tp>& __va) noexcept + { return __va.size() ? std::__addressof(__va[0]) : nullptr; } /** * @brief Return an iterator pointing to one past the last element of @@ -1230,9 +1232,15 @@ _DEFINE_BINARY_OPERATOR(>=, __greater_equal) * @param __va valarray. */ template<class _Tp> + [[__nodiscard__]] inline _Tp* - end(valarray<_Tp>& __va) - { return std::__addressof(__va[0]) + __va.size(); } + end(valarray<_Tp>& __va) noexcept + { + if (auto __n = __va.size()) + return std::__addressof(__va[0]) + __n; + else + return nullptr; + } /** * @brief Return an iterator pointing to one past the last element of @@ -1240,9 +1248,15 @@ _DEFINE_BINARY_OPERATOR(>=, __greater_equal) * @param __va valarray. */ template<class _Tp> + [[__nodiscard__]] inline const _Tp* - end(const valarray<_Tp>& __va) - { return std::__addressof(__va[0]) + __va.size(); } + end(const valarray<_Tp>& __va) noexcept + { + if (auto __n = __va.size()) + return std::__addressof(__va[0]) + __n; + else + return nullptr; + } #endif // C++11 /// @} group numeric_arrays |