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add value_holder comparison and i/o

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bolero-MURAKAMI 2018-05-19 18:02:55 +09:00
parent 4dd6a25354
commit 44f16918b7
7 changed files with 258 additions and 12 deletions
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74
sprout/utility/value_holder/io.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2016 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_UTILITY_VALUE_HOLDER_IO_HPP
#define SPROUT_UTILITY_VALUE_HOLDER_IO_HPP
#include <istream>
#include <ostream>
#include <sprout/config.hpp>
#include <sprout/utility/value_holder/value_holder.hpp>
namespace sprout {
//
// operator>>
//
template<typename Elem, typename Traits, typename T>
inline SPROUT_NON_CONSTEXPR std::basic_istream<Elem, Traits>&
operator>>(std::basic_istream<Elem, Traits>& lhs, sprout::value_holder<T>& rhs) {
if (lhs.good()) {
int d = lhs.get();
if (d == ' ') {
T x;
lhs >> x;
rhs = x;
} else {
lhs.setstate(std::ios::failbit);
}
}
return lhs;
}
template<typename Elem, typename Traits, typename T>
inline SPROUT_NON_CONSTEXPR std::basic_istream<Elem, Traits>&
operator>>(std::basic_istream<Elem, Traits>& lhs, sprout::value_holder<T&>& rhs) {
if (lhs.good()) {
int d = lhs.get();
if (d == ' ') {
T x;
lhs >> x;
rhs = x;
} else {
if (d == '-') {
d = lhs.get();
if (d == '-') {
rhs = sprout::value_holder<T&>();
return lhs;
}
}
lhs.setstate(std::ios::failbit);
}
}
return lhs;
}
//
// operator<<
//
template<typename Elem, typename Traits, typename T>
inline SPROUT_NON_CONSTEXPR std::basic_ostream<Elem, Traits>&
operator<<(std::basic_ostream<Elem, Traits>& lhs, sprout::value_holder<T> const& rhs) {
if (lhs.good()) {
if (!rhs) {
lhs << "--";
} else {
lhs << ' ' << *rhs;
}
}
return lhs;
}
} // namespace sprout
#endif // #ifndef SPROUT_UTILITY_VALUE_HOLDER_IO_HPP