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Refactor stream write functionality into a standalone utility

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Glen Fernandes
2019-04-19 09:53:29 -04:00
parent ff56b3649e
commit dabf53a703
8 changed files with 314 additions and 133 deletions
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include/boost/utility/string_view.hpp
+2 -66
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@@ -20,6 +20,7 @@
#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/utility/ostream_string.hpp>
#include <boost/utility/string_view_fwd.hpp>
#include <boost/throw_exception.hpp>
#include <boost/container_hash/hash_fwd.hpp>
@@ -572,77 +573,12 @@ namespace boost {
return basic_string_view<charT, traits>(x) >= y;
}
namespace detail {
template<class charT, class traits>
inline std::size_t sv_os_put(std::basic_ostream<charT, traits>& os,
const charT* data, std::size_t size) {
return static_cast<std::size_t>(os.rdbuf()->sputn(data, size));
}
template<class charT, class traits>
inline bool sv_os_fill(std::basic_ostream<charT, traits>& os,
std::size_t size) {
enum { chunk = 8 };
charT fill[chunk];
std::fill_n(fill, static_cast<std::size_t>(chunk), os.fill());
for (; size > chunk; size -= chunk) {
if (detail::sv_os_put(os, fill, chunk) != chunk) {
return false;
}
}
return detail::sv_os_put(os, fill, size) == size;
}
template<class charT, class traits>
class sv_os_holder {
public:
explicit sv_os_holder(std::basic_ostream<charT, traits>& os)
: os_(&os) { }
~sv_os_holder() BOOST_NOEXCEPT_IF(false) {
if (os_) {
os_->setstate(std::basic_ostream<charT, traits>::badbit);
}
}
void release() {
os_ = 0;
}
private:
sv_os_holder(const sv_os_holder&);
sv_os_holder& operator=(const sv_os_holder&);
std::basic_ostream<charT, traits>* os_;
};
} // namespace detail
// Inserter
template<class charT, class traits>
inline std::basic_ostream<charT, traits>&
operator<<(std::basic_ostream<charT, traits>& os,
const basic_string_view<charT,traits>& str) {
typedef std::basic_ostream<charT, traits> stream;
detail::sv_os_holder<charT, traits> hold(os);
typename stream::sentry entry(os);
if (entry) {
std::size_t width = static_cast<std::size_t>(os.width());
std::size_t size = str.size();
if (width <= size) {
if (detail::sv_os_put(os, str.data(), size) != size) {
return os;
}
} else if ((os.flags() & stream::adjustfield) == stream::left) {
if (detail::sv_os_put(os, str.data(), size) != size ||
!detail::sv_os_fill(os, width - size)) {
return os;
}
} else if (!detail::sv_os_fill(os, width - size) ||
detail::sv_os_put(os, str.data(), size) != size) {
return os;
}
os.width(0);
}
hold.release();
return os;
return boost::ostream_string(os, str.data(), str.size());
}
#if 0