mirror of
https://github.com/bolero-MURAKAMI/Sprout
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34 lines
990 B
C++
34 lines
990 B
C++
#ifndef SPROUT_FUNCTIONAL_BIND1ST_HPP
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#define SPROUT_FUNCTIONAL_BIND1ST_HPP
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#include <functional>
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#include <sprout/config.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>
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class binder1st
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: public std::unary_function<typename Fn::second_argument_type, typename Fn::result_type>
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{
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protected:
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Fn op;
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typename Fn::first_argument_type value;
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public:
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SPROUT_CONSTEXPR binder1st(Fn const& x, typename Fn::first_argument_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 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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// D.9.2 bind1st
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template<typename Fn, typename T>
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SPROUT_CONSTEXPR sprout::binder1st<Fn> bind1st(Fn const& fn, T const& x) {
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return sprout::binder1st<Fn>(fn, typename Fn::first_argument_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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