disti_assert.h

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

  \par Copyright Information

  Copyright (c) 2015 by The DiSTI Corporation.<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