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https://github.com/bolero-MURAKAMI/Sprout.git
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60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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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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=============================================================================*/
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#ifndef SPROUT_OPTIONAL_IO_HPP
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#define SPROUT_OPTIONAL_IO_HPP
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#include <istream>
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#include <ostream>
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#include <sprout/config.hpp>
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#include <sprout/optional/optional.hpp>
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#include <sprout/none.hpp>
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namespace sprout {
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//
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// operator>>
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//
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template<typename Elem, typename Traits, typename T>
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inline SPROUT_NON_CONSTEXPR std::basic_istream<Elem, Traits>&
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operator>>(std::basic_istream<Elem, Traits>& lhs, sprout::optional<T>& rhs) {
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if (lhs.good()) {
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int d = lhs.get();
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if (d == ' ') {
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T x;
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lhs >> x;
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rhs = x;
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} else {
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if (d == '-') {
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d = lhs.get();
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if (d == '-') {
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rhs = sprout::none;
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return lhs;
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}
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}
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lhs.setstate(std::ios::failbit);
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}
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}
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return lhs;
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}
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//
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// operator<<
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//
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template<typename Elem, typename Traits, typename T>
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inline SPROUT_NON_CONSTEXPR std::basic_ostream<Elem, Traits>&
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operator<<(std::basic_ostream<Elem, Traits>& lhs, sprout::optional<T> const& rhs) {
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if (lhs.good()) {
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if (!rhs) {
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lhs << "--";
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} else {
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lhs << ' ' << *rhs;
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}
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}
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return lhs;
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_OPTIONAL_IO_HPP
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