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Merge topic 'stl-support-make_unique-supports-array'

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fa828b8fba STL support: make_unique can now handle array

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !4295
This commit is contained in:
Brad King
2020-01-29 15:23:46 +00:00
committed by Kitware Robot
parent 4e0d69c142 fa828b8fba
commit 5a5bc85e35
1 changed files with 36 additions and 1 deletions
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37
Utilities/std/cm/memory
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@@ -8,6 +8,8 @@
#include <memory> // IWYU pragma: export
#if !defined(CMake_HAVE_CXX_MAKE_UNIQUE)
# include <cstddef>
# include <type_traits>
# include <utility>
#endif
@@ -19,12 +21,45 @@ using std::make_unique;
#else
namespace internals {
template <typename T>
struct make_unique_if
{
using single = std::unique_ptr<T>;
};
template <typename T>
struct make_unique_if<T[]>
{
using unbound_array = std::unique_ptr<T[]>;
};
template <typename T, std::size_t N>
struct make_unique_if<T[N]>
{
using bound_array = void;
};
}
template <typename T, typename... Args>
std::unique_ptr<T> make_unique(Args&&... args)
typename internals::make_unique_if<T>::single make_unique(Args&&... args)
{
return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}
template <typename T>
typename internals::make_unique_if<T>::unbound_array make_unique(std::size_t n)
{
using E = typename std::remove_extent<T>::type;
return std::unique_ptr<T>(new E[n]());
}
template <typename T, typename... Args>
typename internals::make_unique_if<T>::bound_array make_unique(Args&&...) =
delete;
#endif
} // namespace cm