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https://github.com/bolero-MURAKAMI/Sprout.git
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69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
#ifndef SPROUT_FUNCTIONAL_BIND1ST_HPP
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#define SPROUT_FUNCTIONAL_BIND1ST_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/functional/base.hpp>
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#include <sprout/functional/type_traits.hpp>
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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// D.9.1 Class template binder1st
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template<typename Fn, typename T = void, typename = void>
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class binder1st;
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template<typename Fn, typename T>
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class binder1st<
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Fn, T,
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typename std::enable_if<sprout::is_strict_binary_function<Fn>::value>::type
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>
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: public sprout::unary_function<typename Fn::second_argument_type, typename Fn::result_type>
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{
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public:
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typedef typename std::conditional<
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std::is_void<T>::value,
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typename Fn::first_argument_type,
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T
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>::type value_type;
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protected:
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Fn op;
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value_type value;
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public:
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SPROUT_CONSTEXPR binder1st(Fn const& x, value_type const& y)
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: op(x), value(y)
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{}
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SPROUT_CONSTEXPR typename Fn::result_type
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operator()(typename Fn::second_argument_type const& x) const {
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return op(value, x);
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}
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};
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template<typename Fn, typename T>
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class binder1st<
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Fn, T,
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typename std::enable_if<!sprout::is_strict_binary_function<Fn>::value>::type
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> {
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public:
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typedef T value_type;
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protected:
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Fn op;
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value_type value;
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public:
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SPROUT_CONSTEXPR binder1st(Fn const& x, value_type const& y)
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: op(x), value(y)
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{}
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template<typename U>
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SPROUT_CONSTEXPR decltype(op(value, std::declval<U const&>()))
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operator()(U const& x) const {
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return op(value, x);
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}
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};
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// D.9.2 bind1st
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template<typename Fn, typename T>
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inline SPROUT_CONSTEXPR sprout::binder1st<Fn, T>
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bind1st(Fn const& fn, T const& x) {
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return sprout::binder1st<Fn, T>(fn, typename sprout::binder1st<Fn, T>::value_type(x));
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_FUNCTIONAL_BIND1ST_HPP
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