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Full Discussion: c++ calling main() function
Top Forums Programming c++ calling main() function Post 33883 by Perderabo on Wednesday 22nd of January 2003 02:49:04 PM
Old 01-22-2003
I just tried this on several compilers. Ansi C seems to allow calling main(). Ansi C++ seems to always disallow it.

The technique that you describe is a bug. If you were using recursion where you are guaranteed to eventually pop up all the levels that is one thing. But you apparently want to call main() whenever the user feels like it. Each time that you do this, you push another frame on to the stack. Eventually you will overflow your stack. Even if your stack is so large that the program doesn't abort before the box gets rebooted, you have a memory leak.
 

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LEARN ABOUT REDHAT

glpushmatrix

GLPUSHMATRIX(3G)														  GLPUSHMATRIX(3G)

NAME

       glPushMatrix, glPopMatrix - push and pop the current matrix stack

C SPECIFICATION

       void glPushMatrix( void )

C SPECIFICATION

       void glPopMatrix( void )

DESCRIPTION

       There  is  a  stack  of	matrices for each of the matrix modes.	In GL_MODELVIEW mode, the stack depth is at least 32.  In the other modes,
       GL_COLOR, const(PROJECTION), and GL_TEXTURE, the depth is at least 2.  The current matrix in any mode is the matrix on the top of the stack
       for that mode.

       glPushMatrix  pushes  the current matrix stack down by one, duplicating the current matrix.  That is, after a glPushMatrix call, the matrix
       on top of the stack is identical to the one below it.

       glPopMatrix pops the current matrix stack, replacing the current matrix with the one below it on the stack.

       Initially, each of the stacks contains one matrix, an identity matrix.

       It is an error to push a full matrix stack, or to pop a matrix stack that contains only a single matrix.  In either case, the error flag is
       set and no other change is made to GL state.

ERRORS

       GL_STACK_OVERFLOW is generated if glPushMatrix is called while the current matrix stack is full.

       GL_STACK_UNDERFLOW is generated if glPopMatrix is called while the current matrix stack contains only a single matrix.

       GL_INVALID_OPERATION  is generated if glPushMatrix or glPopMatrix is executed between the execution of glBegin and the corresponding execu-
       tion of glEnd.

ASSOCIATED GETS

       glGet with argument GL_MATRIX_MODE
       glGet with argument GL_COLOR_MATRIX
       glGet with argument GL_MODELVIEW_MATRIX
       glGet with argument GL_PROJECTION_MATRIX
       glGet with argument GL_TEXTURE_MATRIX
       glGet with argument GL_COLOR_STACK_DEPTH
       glGet with argument GL_MODELVIEW_STACK_DEPTH
       glGet with argument GL_PROJECTION_STACK_DEPTH
       glGet with argument GL_TEXTURE_STACK_DEPTH
       glGet with argument GL_MAX_MODELVIEW_STACK_DEPTH
       glGet with argument GL_MAX_PROJECTION_STACK_DEPTH
       glGet with argument GL_MAX_TEXTURE_STACK_DEPTH

SEE ALSO

       glFrustum(3G),  glLoadIdentity(3G),  glLoadMatrix(3G),  glMatrixMode(3G),   glMultMatrix(3G),   glOrtho(3G),   glRotate(3G),   glScale(3G),
       glTranslate(3G), glViewport(3G)

																  GLPUSHMATRIX(3G)
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