mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2013 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_OPTIONAL_IO_HPP
|
|
#define SPROUT_OPTIONAL_IO_HPP
|
|
|
|
#include <iosfwd>
|
|
#include <ios>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/optional/optional.hpp>
|
|
#include <sprout/none.hpp>
|
|
|
|
namespace sprout {
|
|
//
|
|
// operator>>
|
|
//
|
|
template<typename Elem, typename Traits, typename T>
|
|
inline std::basic_istream<Elem, Traits>&
|
|
operator>>(std::basic_istream<Elem, Traits>& lhs, sprout::optional<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::none;
|
|
return lhs;
|
|
}
|
|
}
|
|
lhs.setstate(std::ios::failbit);
|
|
}
|
|
}
|
|
return lhs;
|
|
}
|
|
//
|
|
// operator<<
|
|
//
|
|
template<typename Elem, typename Traits, typename T>
|
|
inline std::basic_ostream<Elem, Traits>&
|
|
operator<<(std::basic_ostream<Elem, Traits>& lhs, sprout::optional<T> const& rhs) {
|
|
if (lhs.good()) {
|
|
if (!rhs) {
|
|
lhs << "--";
|
|
} else {
|
|
lhs << ' ' << *rhs;
|
|
}
|
|
}
|
|
return lhs;
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_OPTIONAL_IO_HPP
|