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types/traits: add chaining type modifier

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This commit is contained in:
Danny Robson 2017-09-08 14:10:57 +10:00
parent c105fb4d0f
commit a307b5f777
1 changed files with 38 additions and 2 deletions
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40
types/traits.hpp
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@ -14,12 +14,48 @@
* Copyright 2012-2017 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_TYPES_TRAITS_HPP
#define __UTIL_TYPES_TRAITS_HPP
#ifndef CRUFT_UTIL_TYPES_TRAITS_HPP
#define CRUFT_UTIL_TYPES_TRAITS_HPP
#include <memory>
#include <type_traits>
///////////////////////////////////////////////////////////////////////////////
/// applies a series of type-modifiers to a provided type.
///
/// modifiers are applied in the order they are provided.
///
/// use without any modifiers results in the identity modifier.
namespace util {
//-------------------------------------------------------------------------
template <typename TypeT, template <typename> class ...ModifierT>
struct chain;
//-------------------------------------------------------------------------
template <typename TypeT>
struct chain<TypeT> { using type = TypeT; };
//-------------------------------------------------------------------------
template <
typename TypeT,
template <typename> class HeadT,
template <typename> class ...TailT
>
struct chain<TypeT, HeadT, TailT...> : public chain<
typename HeadT<TypeT>::type,
TailT...
> { };
//-------------------------------------------------------------------------
template <typename T, template <typename> class ...Args>
using chain_t = typename chain<T, Args...>::type;
}
///////////////////////////////////////////////////////////////////////////////
template <typename T> struct is_dereferencable : std::false_type { };
template <typename T> struct is_dereferencable<T*> : std::true_type { };