utility/helpers.hpp

// The MIT License (MIT)

// Copyright (c) 2012-2014 Danny Y., Rapptz

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef GEARS_UTILITY_HELPERS_HPP
#define GEARS_UTILITY_HELPERS_HPP

#include <array>
#include <utility>
#include <memory>
#include <type_traits>

namespace gears {
namespace utility {
namespace detail {
template<typename T>
struct unique_type {
    using single = std::unique_ptr<T>;
};

template<typename T>
struct unique_type<T[]> {
    using array = std::unique_ptr<T[]>;
};

template<typename T, size_t N>
struct unique_type<T[N]> {
    using unknown = void;
};
} // detail

template<typename T, typename... Args>
constexpr std::array<T, sizeof...(Args)> make_array(Args&&... args) {
    return std::array<T, sizeof...(Args)>{{ std::forward<Args>(args)... }};
}

template<typename T, typename... Args>
inline typename detail::unique_type<T>::single make_unique(Args&&... args) {
    return std::unique_ptr<T>{new T(std::forward<Args>(args)...)};
}

template<typename T>
inline typename detail::unique_type<T>::array make_unique(size_t size) {
    using U = typename std::remove_extent<T>::type;
    return std::unique_ptr<T>{new U[size]()};
}

template<typename T, typename... Args>
inline typename detail::unique_type<T>::unknown make_unique(Args&&... args) = delete;
} // utility
} // gears

#endif // GEARS_UTILITY_HELPERS_HPP