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add memory::UsesAllocator,UsesAllocatorConstructor

master
Daniel Kolesa 2015-07-10 23:50:01 +01:00
parent 64cfb5b715
commit 06a91b98f5
1 changed files with 41 additions and 0 deletions
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41
octa/memory.hh
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@ -1068,10 +1068,51 @@ inline AllocatorType<A> allocator_container_copy(const A &a) {
>(), a);
}
/* allocator arg */
struct AllocatorArg {};
constexpr AllocatorArg allocator_arg = AllocatorArg();
/* uses allocator */
namespace detail {
template<typename T> struct HasAllocatorType {
template<typename U> static char test(typename U::Allocator *);
template<typename U> static int test(...);
static constexpr bool value = (sizeof(test<T>(0)) == 1);
};
template<typename T, typename A, bool = HasAllocatorType<T>::value>
struct UsesAllocatorBase: IntegralConstant<bool,
IsConvertible<A, typename T::Allocator>::value
> {};
template<typename T, typename A>
struct UsesAllocatorBase<T, A, false>: False {};
}
template<typename T, typename A>
struct UsesAllocator: detail::UsesAllocatorBase<T, A> {};
/* uses allocator ctor */
namespace detail {
template<typename T, typename A, typename ...Args>
struct UsesAllocCtor {
static constexpr bool ua = UsesAllocator<T, A>::value;
static constexpr bool ic = IsConstructible<
T, AllocatorArg, A, Args...
>::value;
static constexpr int value = ua ? (2 - ic) : 0;
};
}
template<typename T, typename A, typename ...Args>
struct UsesAllocatorConstructor: IntegralConstant<int,
detail::UsesAllocCtor<T, A, Args...>::value
> {};
} /* namespace octa */
#endif