Standard_Assert.hxx File Reference

This header file defines a set of ASSERT macros intended for use in algorithms for debugging purposes and as a tool to organise checks for abnormal situations in the uniform way. More...

#include <Standard_ProgramError.hxx>

Data Structures
struct	Standard_Static_Assert< condition >
	Static assert – empty default template. More...
struct	Standard_Static_Assert< true >
	Static assert – specialization for condition being true. More...

Macros
#define	Standard_ASSERT_INVOKE_(theExpr, theDesc)   Standard_ASSERT_DO_NOTHING()
#define	Standard_ASSERT(theExpr, theDesc, theAction)
#define	Standard_ASSERT_SKIP(theExpr, theDesc)   theExpr
#define	Standard_ASSERT_VOID(theExpr, theDesc)   Standard_ASSERT_DO_NOTHING()
#define	Standard_ASSERT_RAISE(theExpr, theDesc)
	Raise exception (Standard_ProgramError) with the provided message. More...
#define	Standard_ASSERT_RETURN(theExpr, theDesc, theReturnValue)   Standard_ASSERT(theExpr, theDesc, return theReturnValue)
	Return from the current function with specified value (empty if the function returns void) More...
#define	Standard_ASSERT_INVOKE(theDesc)   Standard_ASSERT_INVOKE_(always, theDesc)
	Raise debug message. More...
#define	Standard_STATIC_ASSERT(theExpr)   Standard_Static_Assert<theExpr>::assert_ok();
	Cause compiler error if argument is not constant expression or evaluates to false. More...

Functions
void	Standard_ASSERT_DO_NOTHING ()

Detailed Description

This header file defines a set of ASSERT macros intended for use in algorithms for debugging purposes and as a tool to organise checks for abnormal situations in the uniform way.

In contrast to C assert() function that terminates the process, these macros provide choice of the action to be performed if assert failed, thus allowing execution to continue when possible. Except for the message for developer that appears only in Debug mode, the macros behave in the same way in both Release and Debug modes.

The ASSERT macros differ in the way they react on a wrong situation:

• Standard_ASSERT_RAISE: raises exception Standard_ProgramError
• Standard_ASSERT_RETURN: returns specified value (last argument may be left empty to return void)
• Standard_ASSERT_SKIP: does nothing
• Standard_ASSERT_VOID: does nothing; even does not evaluate first arg when in Release mode
• Standard_ASSERT_INVOKE: causes unconditional assert
• Standard_ASSERT: base macro (used by other macros); does operation indicated in argument "todo"

The assertion is assumed to fail if the first argument is evaluated to zero (false). The first argument is evaluated by all macros except Standard_ASSERT_VOID which does not evaluate first argument when in Release mode. The mode is triggered by preprocessor macro _DEBUG: if it is defined, Debug mode is assumed, Release otherwise.

In debug mode, if condition is not satisfied the macros call Standard_ASSERT_INVOKE_ which:

• on Windows (under VC++), stops code execution and prompts to attach debugger to the process immediately.
• on POSIX systems, prints message to cerr and raises signal SIGTRAP to stop execution when under debugger (may terminate the process if not under debugger).

The second argument (message) should be string constant ("...").

The Standard_STATIC_ASSERT macro is to be used for compile time checks. To use this macro, write:

Standard_STATIC_ASSERT(const_expression);

If const_expression is false, a compiler error occurs.

The macros are formed as functions and require semicolon at the end.

Macro Definition Documentation

#define Standard_ASSERT	(		theExpr,
			theDesc,
			theAction
	)

Value:

if (!(theExpr)) { theAction; }                     \
    else Standard_ASSERT_DO_NOTHING()

#define Standard_ASSERT_INVOKE

(

theDesc

)

Standard_ASSERT_INVOKE_(always, theDesc)

Raise debug message.

#define Standard_ASSERT_INVOKE_	(		theExpr,
			theDesc
	)		Standard_ASSERT_DO_NOTHING()

#define Standard_ASSERT_RAISE	(		theExpr,
			theDesc
	)

Value:

Standard_ASSERT(theExpr, theDesc, Standard_ProgramError::Raise(                \
      "*** ERROR: ASSERT in file '" __FILE__ "': \n" theDesc " (" #theExpr ")" ) )

Raise exception (Standard_ProgramError) with the provided message.

#define Standard_ASSERT_RETURN	(		theExpr,
			theDesc,
			theReturnValue
	)		Standard_ASSERT(theExpr, theDesc, return theReturnValue)

Return from the current function with specified value (empty if the function returns void)

#define Standard_ASSERT_SKIP	(		theExpr,
			theDesc
	)		theExpr

#define Standard_ASSERT_VOID	(		theExpr,
			theDesc
	)		Standard_ASSERT_DO_NOTHING()

#define Standard_STATIC_ASSERT

(

theExpr

)

Standard_Static_Assert<theExpr>::assert_ok();

Cause compiler error if argument is not constant expression or evaluates to false.

Function Documentation

void Standard_ASSERT_DO_NOTHING ( )

inline