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75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_FUNCTIONAL_ON_HPP
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#define RANGES_V3_FUNCTIONAL_ON_HPP
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#include <concepts/concepts.hpp>
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#include <range/v3/detail/config.hpp>
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#include <range/v3/functional/invoke.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-functional
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/// @{
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template<typename Fn1, typename Fn2>
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struct transformed
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{
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private:
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RANGES_NO_UNIQUE_ADDRESS
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Fn1 first_;
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RANGES_NO_UNIQUE_ADDRESS
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Fn2 second_;
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public:
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transformed() = default;
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constexpr transformed(Fn1 fn1, Fn2 fn2)
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: first_(static_cast<Fn1 &&>(fn1))
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, second_(static_cast<Fn2 &&>(fn2))
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{}
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// clang-format off
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template<typename... Args>
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auto CPP_auto_fun(operator())(Args &&... args)
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(
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return invoke(first_, invoke(second_, static_cast<Args &&>(args)...))
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)
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template<typename... Args>
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auto CPP_auto_fun(operator())(Args &&... args)(const)
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(
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return invoke((Fn1 const &)first_,
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invoke((Fn2 const &)second_, static_cast<Args &&>(args))...)
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)
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// clang-format on
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};
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struct on_fn
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{
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template<typename Fn1, typename Fn2>
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constexpr transformed<Fn1, Fn2> operator()(Fn1 fn1, Fn2 fn2) const
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{
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return transformed<Fn1, Fn2>{detail::move(fn1), detail::move(fn2)};
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}
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};
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/// \ingroup group-functional
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/// \sa `on_fn`
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RANGES_INLINE_VARIABLE(on_fn, on)
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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