disti_assert.h

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/*! \file
  \brief  Contains the DistiAssert macro.

  \par Copyright Information

  Copyright (c) 2017 by The DiSTI Corporation.<br>
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  <br>
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Derivative Works based on this or other copyrighted DiSTI Software.

  NO WARRANTY. THE SOFTWARE IS PROVIDED "AS-IS," WITHOUT WARRANTY OF ANY KIND,
AND ANY USE OF THIS SOFTWARE PRODUCT IS AT YOUR OWN RISK. TO THE MAXIMUM EXTENT
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AND CONDITIONS, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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*/
#ifndef INCLUDED_DISTI_ASSERT_H
#define INCLUDED_DISTI_ASSERT_H

#include "disti_include.h"
#include "gls_cpp_lang_support.h"
#include <stddef.h>

namespace disti
{
class DistiException;
DISTI_EXPORT void swap( DistiException& first, DistiException& second );

/** DistiException just contains a string error message */
class DistiException
{
public:
    explicit DISTI_EXPORT DistiException( const char* what );
    DISTI_EXPORT          DistiException( const DistiException& other );
    DISTI_EXPORT DistiException& operator=( DistiException other );
#ifdef DISTI_HAS_RVAL_REFS
    DISTI_EXPORT DistiException( DistiException&& other );
#endif
    virtual DISTI_EXPORT ~DistiException();
    virtual DISTI_EXPORT const char* what() const; // never returns NULL
    friend DISTI_EXPORT void         swap( DistiException& first, DistiException& second );

private:
    char*  _what;
    size_t _len;
};

/** The callback type. It receives an error message string */
typedef void ( *DistiAssertHandler )( const char* errMessage );

/* This function enables users to override the default behavior of DistiAssert(), which is used
 * throughout the GL Studio code base to test prerequisites etc. The user can set a function to
 * be called when DistiAssert fires. Only one callback can be registered, so calling the set 
 * function multiple times overwrites the previous handler. If the given handler is null, 
 * DistiAssert() reverts to its default behavior. 
 * \note This function is deprecated; Use SetGlsVerifyHandler or SetGlsAssertHandler instead.
 */
DISTI_EXPORT void SetDistiAssertHandler( DistiAssertHandler );

/* This function enables users to override the default behavior of GLS_VERIFY(), which is used
 * throughout the GL Studio code base to test prerequisites etc. The user can set a function to
 * be called when GLS_VERIFY fires. Only one callback can be registered, so calling the set 
 * function multiple times overwrites the previous handler. If the given handler is null, 
 * GLS_VERIFY() reverts to its default behavior. 
 */
DISTI_EXPORT void SetGlsVerifyHandler( DistiAssertHandler );

/* This function enables users to override the default behavior of GLS_ASSERT(), which is used
 * throughout the GL Studio code base to test prerequisites etc. The user can set a function to
 * be called when GLS_ASSERT fires. Only one callback can be registered, so calling the set 
 * function multiple times overwrites the previous handler. If the given handler is null, 
 * GLS_ASSERT() reverts to its default behavior. 
 */
DISTI_EXPORT void SetGlsAssertHandler( DistiAssertHandler );

/* DistiAssert
 * \note This function is deprecated; Use GLS_ASSERT or GLS_VERIFY instead.
 * If a callback is registered, that function is invoked when an assertion fails (exp is false). 
 * If the callback is null, when the assertion fails, DistiAssert will popup a messagebox allowing 
 * the user to Abort, Retry(Debug) or Ignore the error. Retry will cause a User breakpoint on the 
 * error, Abort will throw a DistiException describing the error, and Ignore does nothing.
 * 
 * At present, the function does the same thing in debug and release modes.
 */
#if defined( GLS_DEBUG )
#    define DistiAssert( exp ) (void)( ( exp ) || ( ::disti::DistiAssertDebug( #    exp, __FILE__, __LINE__ ), 0 ) )
#else
#    define DistiAssert( exp ) (void)( ( exp ) || ( ::disti::DistiAssertRelease( #    exp, __FILE__, __LINE__ ), 0 ) )
#endif

#define GLS_UNUSED( exp )    \
    do                       \
    {                        \
        (void)sizeof( exp ); \
    } while( 0 )

/** In builds where GLS_DEBUG is defined OR where NDEBUG is not defined, this macro has the following behavior:
  * 
  *   1. If a callback is registered with SetGlsAssertHandler(), that handler is invoked when an assertion
  *      fails (\a exp is false).
  *      
  *   2. If no handler is registered and the assertion fails, on Windows GLS_ASSERT will popup a message box
  *      allowing the user to Abort, Retry (Debug), or Ignore the error. Retry will cause a User breakpoint 
  *      on the error, Abort will throw a DistiException describing the error, and Ignore does nothing.
  *      
  * If none of the aforementioned symbols are defined, this function does nothing, and does not evaluate \a exp.
  *
  * \note Use this function instead of the deprecated DistiAssert() macro for checks that should be tested in
  *       Debug builds only.
  */
#if defined( GLS_DEBUG ) || !defined( NDEBUG )
#    define GLS_ASSERT( exp )                                                           \
        do                                                                              \
        {                                                                               \
            (void)( ( exp ) || ( ::disti::GlsAssert( #exp, __FILE__, __LINE__ ), 0 ) ); \
        } while( 0 )
#else
#    define GLS_ASSERT( exp ) GLS_UNUSED( exp )
#endif

/** The GLS_VERIFY() macro has the following behavior:
  * 
  *   1. If a callback is registered with SetGlsVerifyHandler(), that handler is invoked when \a exp is false.
  *      
  *   2. If no handler is registered and the \a exp is false, on Windows GLS_VERIFY() will popup a message box
  *      allowing the user to Abort, Retry (Debug), or Ignore the error. Retry will cause a User breakpoint 
  *      on the error, Abort will throw a DistiException describing the error, and Ignore does nothing.
  *
  * \note Use this function instead of the deprecated DistiAssert() macro for checks that should be tested in
  *       both Debug and Release builds.
  */
#define GLS_VERIFY( exp ) (void)( ( exp ) || ( ::disti::GlsVerify( #exp, __FILE__, __LINE__ ), 0 ) )

/** Do not call DistiAssertDebug directly, instead use the DistiAssert macro
  * \note This function is deprecated; Use GlsAssert or GlsVerify instead.
  */
DISTI_EXPORT void DistiAssertDebug( const char* expression, const char* filename, unsigned int lineNumber );
/** Do not call DistiAssertRelease directly, instead use the DistiAssert macro
  * \note This function is deprecated; Use GlsAssert or GlsVerify instead.
  */
DISTI_EXPORT void DistiAssertRelease( const char* expression, const char* filename, unsigned int lineNumber );

/** Do not call GlsVerify directly, instead use the GLS_VERIFY macro */
DISTI_EXPORT void GlsVerify( const char* expression, const char* filename, unsigned int lineNumber );

/** Do not call GlsAssert directly, instead use the GLS_ASSERT macro */
DISTI_EXPORT void GlsAssert( const char* expression, const char* filename, unsigned int lineNumber );

/** Assert the pointer is not null and return it */
template<class T>
T* ValidatePointer( const T* const p )
{
    DistiAssert( p );
    return p;
}

} // namespace disti

#endif