114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
// Copyright (c) 2016-2022 Antony Polukhin
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PFR_IO_HPP
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#define BOOST_PFR_IO_HPP
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#pragma once
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#include <boost/pfr/detail/config.hpp>
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#include <boost/pfr/detail/detectors.hpp>
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#include <boost/pfr/io_fields.hpp>
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/// \file boost/pfr/io.hpp
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/// Contains IO stream manipulator \forcedlink{io} for types.
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/// If type is streamable using its own operator or its conversion operator, then the types operator is used.
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///
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/// \b Example:
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/// \code
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/// #include <boost/pfr/io.hpp>
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/// struct comparable_struct { // No operators defined for that structure
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/// int i; short s; char data[7]; bool bl; int a,b,c,d,e,f;
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/// };
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/// // ...
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///
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/// comparable_struct s1 {0, 1, "Hello", false, 6,7,8,9,10,11};
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/// std::cout << boost::pfr::io(s1); // Outputs: {0, 1, H, e, l, l, o, , , 0, 6, 7, 8, 9, 10, 11}
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/// \endcode
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///
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/// \podops for other ways to define operators and more details.
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///
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/// \b Synopsis:
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namespace boost { namespace pfr {
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namespace detail {
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///////////////////// Helper typedefs
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template <class Stream, class Type>
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using enable_not_ostreamable_t = std::enable_if_t<
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not_appliable<ostreamable_detector, Stream&, const std::remove_reference_t<Type>&>::value,
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Stream&
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>;
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template <class Stream, class Type>
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using enable_not_istreamable_t = std::enable_if_t<
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not_appliable<istreamable_detector, Stream&, Type&>::value,
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Stream&
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>;
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template <class Stream, class Type>
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using enable_ostreamable_t = std::enable_if_t<
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!not_appliable<ostreamable_detector, Stream&, const std::remove_reference_t<Type>&>::value,
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Stream&
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>;
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template <class Stream, class Type>
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using enable_istreamable_t = std::enable_if_t<
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!not_appliable<istreamable_detector, Stream&, Type&>::value,
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Stream&
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>;
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///////////////////// IO impl
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template <class T>
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struct io_impl {
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T value;
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};
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template <class Char, class Traits, class T>
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enable_not_ostreamable_t<std::basic_ostream<Char, Traits>, T> operator<<(std::basic_ostream<Char, Traits>& out, io_impl<T>&& x) {
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return out << boost::pfr::io_fields(std::forward<T>(x.value));
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}
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template <class Char, class Traits, class T>
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enable_ostreamable_t<std::basic_ostream<Char, Traits>, T> operator<<(std::basic_ostream<Char, Traits>& out, io_impl<T>&& x) {
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return out << x.value;
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}
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template <class Char, class Traits, class T>
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enable_not_istreamable_t<std::basic_istream<Char, Traits>, T> operator>>(std::basic_istream<Char, Traits>& in, io_impl<T>&& x) {
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return in >> boost::pfr::io_fields(std::forward<T>(x.value));
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}
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template <class Char, class Traits, class T>
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enable_istreamable_t<std::basic_istream<Char, Traits>, T> operator>>(std::basic_istream<Char, Traits>& in, io_impl<T>&& x) {
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return in >> x.value;
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}
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} // namespace detail
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/// IO manupulator to read/write \aggregate `value` using its IO stream operators or using \forcedlink{io_fields} if operators are not awailable.
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///
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/// \b Example:
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/// \code
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/// struct my_struct { int i; short s; };
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/// my_struct s;
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/// std::stringstream ss;
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/// ss << "{ 12, 13 }";
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/// ss >> boost::pfr::io(s);
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/// assert(s.i == 12);
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/// assert(s.i == 13);
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/// \endcode
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///
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/// \customio
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template <class T>
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auto io(T&& value) noexcept {
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return detail::io_impl<T>{std::forward<T>(value)};
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}
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}} // namespace boost::pfr
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#endif // BOOST_PFR_IO_HPP
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