nerdcruft/libcruft-util
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Add traits helpers for dereferencable types

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This commit is contained in:
Danny Robson 2012-04-13 11:30:22 +10:00
parent af05331358
commit 18b862350a
1 changed files with 22 additions and 1 deletions
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23
types.hpp
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@ -75,7 +75,8 @@ struct sized_type : public bits_type<sizeof(T) * 8>
template <typename T> template <typename T>
std::string type_to_string (void); std::string
type_to_string (void);
namespace detail { namespace detail {
@ -142,6 +143,7 @@ template <typename T, size_t N>
size_t elems(T (&)[N]) size_t elems(T (&)[N])
{ return N; } { return N; }
template<class T, class...Args> template<class T, class...Args>
std::unique_ptr<T> make_unique(Args&&... args) { std::unique_ptr<T> make_unique(Args&&... args) {
return std::unique_ptr<T> (new T(std::forward<Args>(args)...)); return std::unique_ptr<T> (new T(std::forward<Args>(args)...));
@ -161,6 +163,25 @@ struct fourcc {
std::ostream& operator<< (std::ostream&, fourcc); std::ostream& operator<< (std::ostream&, fourcc);
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 { };
template <typename T> struct is_dereferencable<std::shared_ptr<T>> : std::true_type { };
template <typename T> struct is_dereferencable<std::weak_ptr<T>> : std::true_type { };
template <typename T> struct is_dereferencable<std::auto_ptr<T>> : std::true_type { };
template <typename T> struct dereferenced_type {
typedef typename std::enable_if<
std::is_pointer<T>::value,
std::remove_pointer<T>
>::type type;
};
template <typename T> struct dereferenced_type<std::unique_ptr<T>> { typedef T type; };
template <typename T> struct dereferenced_type<std::shared_ptr<T>> { typedef T type; };
template <typename T> struct dereferenced_type<std::weak_ptr<T>> { typedef T type; };
template <typename T> struct dereferenced_type<std::auto_ptr<T>> { typedef T type; };
#endif // __TYPES_HPP #endif // __TYPES_HPP