apr_version.h File Reference

APR Versioning Interface. More...

#include "apr.h"

Go to the source code of this file.

Data Structures

struct  apr_version_t


#define APR_VERSION_AT_LEAST(major, minor, patch)
#define APR_IS_DEV_STRING   "-dev"
#define APR_STRINGIFY_HELPER(n)   #n


void apr_version (apr_version_t *pvsn)
const char * apr_version_string (void)

Detailed Description

APR Versioning Interface.

APR's Version

There are several different mechanisms for accessing the version. There is a string form, and a set of numbers; in addition, there are constants which can be compiled into your application, and you can query the library being used for its actual version.

Note that it is possible for an application to detect that it has been compiled against a different version of APR by use of the compile-time constants and the use of the run-time query function.

APR version numbering follows the guidelines specified in:


Define Documentation

#define APR_IS_DEV_STRING   "-dev"

Internal: string form of the "is dev" flag


major version Major API changes that could cause compatibility problems for older programs such as structure size changes. No binary compatibility is possible across a change in the major version.


minor version Minor API changes that do not cause binary compatibility problems. Reset to 0 when upgrading APR_MAJOR_VERSION


patch level The Patch Level never includes API changes, simply bug fixes. Reset to 0 when upgrading APR_MINOR_VERSION


Properly quote a value as a string in the C preprocessor

#define APR_STRINGIFY_HELPER (  )     #n

Helper macro for APR_STRINGIFY

#define APR_VERSION_AT_LEAST ( major,
patch   ) 


(((major) < APR_MAJOR_VERSION)                                     \
 || ((major) == APR_MAJOR_VERSION && (minor) < APR_MINOR_VERSION) \
 || ((major) == APR_MAJOR_VERSION && (minor) == APR_MINOR_VERSION && (patch) <= APR_PATCH_VERSION))
The symbol APR_IS_DEV_VERSION is only defined for internal, "development" copies of APR. It is undefined for released versions of APR. Check at compile time if the APR version is at least a certain level.
major The major version component of the version checked for (e.g., the "1" of "1.3.0").
minor The minor version component of the version checked for (e.g., the "3" of "1.3.0").
patch The patch level component of the version checked for (e.g., the "0" of "1.3.0").
This macro is available with APR versions starting with 1.3.0.




                             ##APR_MINOR_VERSION ##, \
An alternative formatted string of APR's version

Function Documentation

void apr_version ( apr_version_t pvsn  ) 

Return APR's version information information in a numeric form.

pvsn Pointer to a version structure for returning the version information.

const char* apr_version_string ( void   ) 

Return APR's version information as a string.

Generated on Sat Aug 16 19:13:40 2008 for Apache Portable Runtime by  doxygen 1.5.6