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Added and_t and or_t templates

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rbock 2014-02-02 18:43:07 +01:00
parent d288c65897
commit 14c382db59
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include/sqlpp11/detail/logic.h Normal file
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/*
* Copyright (c) 2013, Roland Bock
* 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.
*
* 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 OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (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
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SQLPP_DETAIL_LOGIC_H
#define SQLPP_DETAIL_LOGIC_H
#include <type_traits>
namespace sqlpp
{
namespace detail
{
template<bool... b>
struct and_impl;
template<>
struct and_impl<>
{
static constexpr bool value = true;
};
template<bool... Rest>
struct and_impl<true, Rest...>
{
static constexpr bool value = and_impl<Rest...>::value;
};
template<bool... Rest>
struct and_impl<false, Rest...>
{
static constexpr bool value = false;
};
template<template<typename> class Predicate, typename... T>
using and_t = and_impl<Predicate<T>::value...>;
template<bool... b>
struct or_impl;
template<>
struct or_impl<>
{
static constexpr bool value = false;
};
template<bool... Rest>
struct or_impl<false, Rest...>
{
static constexpr bool value = or_impl<Rest...>::value;
};
template<bool... Rest>
struct or_impl<true, Rest...>
{
static constexpr bool value = true;
};
template<template<typename> class Predicate, typename... T>
using or_t = or_impl<Predicate<T>::value...>;
}
}
#endif