mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 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_STRING_IO_HPP
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#define SPROUT_STRING_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/workaround/std/cstddef.hpp>
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#include <sprout/string/string.hpp>
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namespace sprout {
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//
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// operator>>
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// operator<<
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//
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template<typename T, std::size_t N, typename Traits, typename StreamTraits>
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inline SPROUT_NON_CONSTEXPR std::basic_istream<T, StreamTraits>&
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operator>>(std::basic_istream<T, StreamTraits>& lhs, sprout::basic_string<T, N, Traits>& rhs) {
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typedef T elem_type;
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typedef StreamTraits traits_type;
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typedef std::basic_istream<T, StreamTraits> istream_type;
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typedef sprout::basic_string<T, N, Traits> string_type;
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typedef std::ctype<elem_type> ctype_type;
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typedef typename string_type::size_type size_type;
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std::ios_base::iostate state = std::ios_base::goodbit;
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bool changed = false;
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size_type current = 0;
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if (typename istream_type::sentry(lhs)) {
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ctype_type const& ctype_fac = std::use_facet<ctype_type>(lhs.getloc());
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try {
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size_type remain = 0 < lhs.width() && static_cast<size_type>(lhs.width()) < rhs.max_size()
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? static_cast<size_type>(lhs.width())
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: rhs.max_size()
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;
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typename traits_type::int_type meta = lhs.rdbuf()->sgetc();
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for (; remain; --remain, meta = lhs.rdbuf()->snextc())
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if (traits_type::eq_int_type(traits_type::eof(), meta)) {
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state |= std::ios_base::eofbit;
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break;
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} else if (ctype_fac.is(ctype_type::space, traits_type::to_char_type(meta))) {
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break;
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} else {
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rhs[current] = traits_type::to_char_type(meta);
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changed = true;
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++current;
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}
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} catch (...) {
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state |= std::ios_base::badbit;
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}
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}
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lhs.width(0);
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if (!changed) {
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state |= std::ios_base::failbit;
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}
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lhs.setstate(state);
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rhs.resize(current);
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return lhs;
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}
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template<typename T, std::size_t N, typename Traits, typename StreamTraits>
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inline SPROUT_NON_CONSTEXPR std::basic_ostream<T, StreamTraits>&
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operator<<(std::basic_ostream<T, StreamTraits>& lhs, sprout::basic_string<T, N, Traits> const& rhs) {
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return lhs << rhs.c_str();
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_STRING_IO_HPP
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