has_no_allocated_data.h

/*  This file is part of the Vc library. {{{
Copyright © 2014-2015 Matthias Kretz <kretz@kde.org>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the names of contributing organizations nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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}}}*/

#ifndef VC_TRAITS_HAS_NO_ALLOCATED_DATA_H_
#define VC_TRAITS_HAS_NO_ALLOCATED_DATA_H_

#include <array>

namespace Vc_VERSIONED_NAMESPACE
{
namespace Traits
{

template<typename T> struct has_no_allocated_data_impl : public std::false_type {};

template <typename T>
struct has_no_allocated_data
    : public has_no_allocated_data_impl<
          typename std::remove_cv<typename std::remove_reference<T>::type>::type>
{
};

// spezializations:
template<typename T, std::size_t N> struct has_no_allocated_data_impl<std::array<T, N>> : public std::true_type {};
template<typename T, std::size_t N> struct has_no_allocated_data_impl<T[N]> : public std::true_type {};
template<typename T> struct has_no_allocated_data_impl<T[]> : public std::true_type {};

// tests:
static_assert(has_no_allocated_data<int[256]>::value, "");
static_assert(has_no_allocated_data<const int[256]>::value, "");
static_assert(has_no_allocated_data<volatile int[256]>::value, "");
static_assert(has_no_allocated_data<const volatile int[256]>::value, "");

static_assert(has_no_allocated_data<int[]>::value, "");
static_assert(has_no_allocated_data<int[2][2]>::value, "");

static_assert(has_no_allocated_data<const volatile std::array<int, 256> &>::value, "");
static_assert(has_no_allocated_data<const volatile std::array<int, 256>>::value, "");
static_assert(has_no_allocated_data<volatile std::array<int, 256> &>::value, "");
static_assert(has_no_allocated_data<volatile std::array<int, 256>>::value, "");
static_assert(has_no_allocated_data<const std::array<int, 256> &>::value, "");
static_assert(has_no_allocated_data<const std::array<int, 256>>::value, "");
static_assert(has_no_allocated_data<std::array<int, 256>>::value, "");
static_assert(has_no_allocated_data<std::array<int, 256> &&>::value, "");
static_assert(!has_no_allocated_data<int*>::value, "");
static_assert(!has_no_allocated_data<const int*>::value, "");
static_assert(!has_no_allocated_data<const int *const>::value, "");
static_assert(!has_no_allocated_data<int *const>::value, "");

}  // namespace Traits
}  // namespace Vc

#endif // VC_TRAITS_HAS_NO_ALLOCATED_DATA_H_