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fold.h
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fold.h
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/**
* Reaver Library Licence
*
* Copyright © 2015 Michał "Griwes" Dominiak
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation is required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
**/
#pragma once
#include <utility>
namespace reaver
{
inline namespace prelude { inline namespace _v1
{
template<typename F, typename T>
inline constexpr auto foldr(F &&, T && t)
{
return std::forward<T>(t);
}
template<typename F, typename T, typename U, typename... Ts>
inline constexpr auto foldr(F && f, T && t, U && u, Ts &&... ts)
{
return f(std::forward<U>(u), foldr(f, std::forward<T>(t), std::forward<Ts>(ts)...));
}
template<typename F, typename T>
inline constexpr auto foldl(F &&, T && t)
{
return std::forward<T>(t);
}
template<typename F, typename T, typename U, typename... Ts>
inline constexpr auto foldl(F && f, T && t, U && u, Ts &&... ts)
{
return foldl(f, f(std::forward<T>(t), std::forward<U>(u)), std::forward<Ts>(ts)...);
}
}}
}