ACE_Errno_Guard Class Reference

Provides a wrapper to improve performance when thread-specific errno must be saved and restored in a block of code. More...

#include <OS_Errno.h>

Public Member Functions
	ACE_Errno_Guard (ACE_ERRNO_TYPE &errno_ref, int error)
	ACE_Errno_Guard (ACE_ERRNO_TYPE &errno_ref)
	Initialize the errno_ptr_ to the address of errno_ref. More...
	~ACE_Errno_Guard (void)
	Reset the value of errno to <error>. More...
int	operator= (int error)
	Assign <error> to <error_>. More...
bool	operator== (int error)
	Compare <error> with <error_> for equality. More...
bool	operator!= (int error)
	Compare <error> with <error_> for inequality. More...

Private Member Functions
	ACE_Errno_Guard (const ACE_Errno_Guard &)
ACE_Errno_Guard &	operator= (const ACE_Errno_Guard &)

Private Attributes
int	error_

Detailed Description

Provides a wrapper to improve performance when thread-specific errno must be saved and restored in a block of code.

The typical use-case for this is the following: int error = errno; call_some_function_that_might_change_errno (); errno = error; This can be replaced with { ACE_Errno_Guard guard (errno); call_some_function_that_might_change_errno (); } This implementation is more elegant and more efficient since it avoids an unnecessary second access to thread-specific storage by caching a pointer to the value of errno in TSS.

Constructor & Destructor Documentation

ACE_Errno_Guard::ACE_Errno_Guard ( ACE_ERRNO_TYPE &  errno_ref, int  error  )

inline

Stash the value of error into error_ and initialize the errno_ptr_ to the address of errno_ref.

ACE_Errno_Guard::ACE_Errno_Guard ( ACE_ERRNO_TYPE &  errno_ref )

inline

Initialize the errno_ptr_ to the address of errno_ref.

ACE_Errno_Guard::~ACE_Errno_Guard ( void  )

inline

Reset the value of errno to <error>.

ACE_Errno_Guard::ACE_Errno_Guard ( const ACE_Errno_Guard &  )

private

Member Function Documentation

bool ACE_Errno_Guard::operator!= ( int  error )

inline

Compare <error> with <error_> for inequality.

int ACE_Errno_Guard::operator= ( int  error )

inline

Assign <error> to <error_>.

ACE_Errno_Guard& ACE_Errno_Guard::operator= ( const ACE_Errno_Guard &  )

private

bool ACE_Errno_Guard::operator== ( int  error )

inline

Compare <error> with <error_> for equality.

Member Data Documentation

int ACE_Errno_Guard::error_

private

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

• OS_Errno.h
• OS_Errno.inl