C/C++ macro/template blackmagic to generate unique name.
- by anon
Macros are fine.
Templates are fine.
Pretty much whatever it works is fine.
The example is OpenGL; but the technique is C++ specific and relies on no knowledge of OpenGL.
Precise problem:
I want an expression E; where I do not have to specify a unique name; such that a constructor is called where E is defined, and a destructor is called where the block E is in ends.
For example, consider:
class GlTranslate {
GLTranslate(float x, float y, float z); {
glPushMatrix();
glTranslatef(x, y, z);
}
~GlTranslate() { glPopMatrix(); }
};
Manual solution:
{
GlTranslate foo(1.0, 0.0, 0.0); // I had ti give it a name
.....
} // auto popmatrix
Now, I have this not only for glTranslate, but lots of other PushAttrib/PopAttrib calls too. I would prefer not to have to come up with a unique name for each var. Is there some trick involving macros templates ... or something else that will automatically create a variable who's constructor is called at point of definition; and destructor called at end of block?
Thanks!
