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types/traits: add remove_restrict

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This commit is contained in:
Danny Robson 2016-03-16 19:27:39 +11:00
parent 678462ba65
commit cac706dd3c
1 changed files with 20 additions and 5 deletions
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25
types/traits.hpp
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@ -20,7 +20,7 @@
#include <memory>
#include <type_traits>
//-----------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////////
template <typename T> struct is_dereferencable : std::false_type { };
template <typename T> struct is_dereferencable<T*> : std::true_type { };
template <typename T> struct is_dereferencable<std::unique_ptr<T>> : std::true_type { };
@ -28,6 +28,7 @@ template <typename T> struct is_dereferencable<std::shared_ptr<T>> : std::true_t
template <typename T> struct is_dereferencable<std::weak_ptr<T>> : std::true_type { };
///////////////////////////////////////////////////////////////////////////////
template <typename T> struct dereferenced_type {
typedef typename std::enable_if<
std::is_pointer<T>::value,
@ -42,7 +43,7 @@ template <typename T> struct dereferenced_type<std::shared_ptr<T>> { typedef T t
template <typename T> struct dereferenced_type<std::weak_ptr<T>> { typedef T type; };
///----------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////////
/// find the unsigned version of a type if one exists
template <typename T>
struct try_unsigned
@ -51,11 +52,12 @@ struct try_unsigned
};
//-----------------------------------------------------------------------------
template <> struct try_unsigned<double> { typedef double type; };
template <> struct try_unsigned<float > { typedef float type; };
///----------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////////
/// find the signed version of a type if one exists
template <typename T>
struct try_signed
@ -63,10 +65,13 @@ struct try_signed
typedef typename std::make_signed<T>::type type;
};
//-----------------------------------------------------------------------------
template <> struct try_signed<double> { typedef double type; };
template <> struct try_signed<float > { typedef float type; };
///----------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////////
/// checks if a type can be converted in all cases without modification
template <typename T, typename U> struct is_lossless_cast : std::enable_if<
std::is_integral<T>::value &&
@ -78,22 +83,32 @@ template <typename T, typename U> struct is_lossless_cast : std::enable_if<
>::value { };
//-----------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////////
template <typename T>
struct func_traits : public func_traits<decltype(&T::operator())>
{ };
//-----------------------------------------------------------------------------
template <typename C, typename R, typename ...Args>
struct func_traits<R(C::*)(Args...) const> {
typedef R return_type;
};
//-----------------------------------------------------------------------------
template <typename R, typename ...Args>
struct func_traits<R(Args...)> {
typedef R return_type;
};
///////////////////////////////////////////////////////////////////////////////
template <typename T> struct remove_restrict { using type = T; };
template <typename T> struct remove_restrict<T *restrict> { using type = T*; };
template <typename T>
using remove_restrict_t = typename remove_restrict<T>::type;
#endif