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types/traits: add the identity type function

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This commit is contained in:
Danny Robson 2018-06-22 17:41:36 +10:00
parent a95388b02b
commit 6c0803b6e9
1 changed files with 16 additions and 0 deletions
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types/traits.hpp
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@ -56,6 +56,22 @@ namespace util {
}
namespace util::types {
///////////////////////////////////////////////////////////////////////////
/// CXX20: An early implementation of std::identity_t and related
/// structures; useful for disabling template argument deduction, and
/// higher order template functions.
template <typename T>
struct identity { using type = T; };
//-------------------------------------------------------------------------
template <typename T>
using identity_t = typename identity<T>::type;
}
///////////////////////////////////////////////////////////////////////////////
template <typename T> struct is_dereferencable : std::false_type { };
template <typename T> struct is_dereferencable<T*> : std::true_type { };