icarus::ns::util::FormatFlagsGuard< IOS > Class Template Reference

Saves some status of the specified stream object, and restores it. More...

#include <BinaryDumpUtils.h>

Public Member Functions
	FormatFlagsGuard (IOS &ios)
	~FormatFlagsGuard ()
void	restore ()

Private Attributes
IOS &	ios
IOS::fmtflags const	flags
IOS::char_type const	fill

Detailed Description

template<typename IOS>
class icarus::ns::util::FormatFlagsGuard< IOS >

Saves some status of the specified stream object, and restores it.

Template Parameters

IOS	type of stream object, with flag interface like std::ostream

This object uses the RIIA pattern to read some status from a stream, and then restore it on the destruction of the object itself. Example:

std::cout << std::hex << 26 << std::endl; // prints "1a"
std::cout << 28 << std::endl; // prints "1c" (hexadecimal format sticks)
{
  icarus::ns::util::FormatFlagsGuard sg(std::cout); // saves std::cout status
  std::cout << std::oct << 26 << std::endl; // prints "32"
  std::cout << 28 << std::endl; // prints "34" (octal format sticks)
  // destruction of sg happens here, std::cout flags are restored
}
std::cout << 28 << std::endl; // prints "1c" (hexadecimal format restored)

Saved settings currently include:

• all format flags (std::ios_base::flags())
• fill character (std::basic_ios::fill())

Definition at line 206 of file BinaryDumpUtils.h.

Constructor & Destructor Documentation

template<typename IOS >

icarus::ns::util::FormatFlagsGuard< IOS >::FormatFlagsGuard ( IOS &  ios )

inline

Definition at line 360 of file BinaryDumpUtils.h.

    : ios{ios}, flags{ios.flags()}, fill{ios.fill()} {}

template<typename IOS >

icarus::ns::util::FormatFlagsGuard< IOS >::~FormatFlagsGuard ( )

inline

Definition at line 363 of file BinaryDumpUtils.h.

{ restore(); }

Member Function Documentation

template<typename IOS >

void icarus::ns::util::FormatFlagsGuard< IOS >::restore ( )

inline

Definition at line 365 of file BinaryDumpUtils.h.

{ ios.flags(flags); ios.fill(fill); }

Member Data Documentation

template<typename IOS >

IOS::char_type const icarus::ns::util::FormatFlagsGuard< IOS >::fill

private

Definition at line 357 of file BinaryDumpUtils.h.

template<typename IOS >

IOS::fmtflags const icarus::ns::util::FormatFlagsGuard< IOS >::flags

private

Definition at line 356 of file BinaryDumpUtils.h.

template<typename IOS >

IOS& icarus::ns::util::FormatFlagsGuard< IOS >::ios

private

Definition at line 353 of file BinaryDumpUtils.h.

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The documentation for this class was generated from the following file:

• BinaryDumpUtils.h