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Add a class that can be used to save and restore IO stream format in a RAII way. Below is an example. auto& os = amrex::OutStream(); auto old_fill = os.fill(); auto old_flags = os.flags(); auto old_precision = os.precision(); auto old_width = os.width(); { IOFormatSaver iofmtsaver(os); os << std::setfill('x'); os << std::left; os << std::setprecision(4); os << std::setw(111); } AMREX_ALWAYS_ASSERT(old_fill == os.fill()); AMREX_ALWAYS_ASSERT(old_flags == os.flags()); AMREX_ALWAYS_ASSERT(old_precision == os.precision()); AMREX_ALWAYS_ASSERT(old_width == os.width());
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#ifndef AMREX_IO_FORMAT_H_ | ||
#define AMREX_IO_FORMAT_H_ | ||
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#include <ios> | ||
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namespace amrex { | ||
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/* | ||
* \brief I/O stream format saver | ||
* | ||
* This class can be used to save and restore I/O stream format in a RAII | ||
* way. It handles fill, fmtflag, precision, and width. | ||
*/ | ||
template <class CharT, class Traits> | ||
class IOFormatSaver | ||
{ | ||
public: | ||
using BasicIos = std::basic_ios<CharT, Traits>; | ||
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explicit IOFormatSaver (BasicIos& ios) | ||
: m_ios(&ios), | ||
m_fill(ios.fill()), | ||
m_flags(ios.flags()), | ||
m_precision(ios.precision()), | ||
m_width(ios.width()) | ||
{} | ||
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~IOFormatSaver () | ||
{ | ||
m_ios->fill(m_fill); | ||
m_ios->flags(m_flags); | ||
m_ios->precision(m_precision); | ||
m_ios->width(m_width); | ||
} | ||
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IOFormatSaver (IOFormatSaver const&) = delete; | ||
IOFormatSaver (IOFormatSaver &&) noexcept = delete; | ||
IOFormatSaver& operator= (IOFormatSaver const&) = delete; | ||
IOFormatSaver& operator= (IOFormatSaver &&) noexcept = delete; | ||
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private: | ||
BasicIos* m_ios; | ||
CharT m_fill; | ||
typename BasicIos::fmtflags m_flags; | ||
std::streamsize m_precision; | ||
std::streamsize m_width; | ||
}; | ||
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} | ||
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#endif |
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