[Closed] Writing C++ mental ray shader

What do I have to do to get shader compiled as C++ to work?

Here is a test shader, compiling it with VS2005 as C it works, if I switch to C++ it doesn’t.

#include "shader.h" 
DLLEXPORT int color_test_texture_version(void) {
	return(1);
}
DLLEXPORT miBoolean color_test_texture (miColor *result, miState *state, void *params) { 
	result->r = 1.0;
	result->g = 0.5;
	result->b = 0.25;
	result->a = 1.0; 
	return miTRUE; 
}

Is there some specific setting I have to turn on or what?