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add functional polymorphic specializations

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bolero-MURAKAMI 2012-10-25 12:50:03 +09:00
parent 5cb070b3b3
commit c8e2514d36
21 changed files with 300 additions and 19 deletions
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16
sprout/functional/minus.hpp
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@ -1,13 +1,15 @@
#ifndef SPROUT_FUNCTIONAL_MINUS_HPP
#define SPROUT_FUNCTIONAL_MINUS_HPP
#include <utility>
#include <sprout/config.hpp>
#include <sprout/utility/forward.hpp>
namespace sprout {
// Copyright (C) 2011 RiSK (sscrisk)
// 20.8.4 Arithmetic operations
template<typename T>
template<typename T = void>
struct minus {
public:
typedef T first_argument_type;
@ -18,6 +20,18 @@ namespace sprout {
return x - y;
}
};
template<>
struct minus<void> {
public:
template<typename T, typename U>
SPROUT_CONSTEXPR decltype(std::declval<T>() - std::declval<U>())
operator()(T&& x, U&& y)
const SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(std::declval<T>() - std::declval<U>()))
{
return sprout::forward<T>(x) - sprout::forward<U>(y);
}
};
} // namespace sprout
#endif // #ifndef SPROUT_FUNCTIONAL_MINUS_HPP