Return value error-checking macro generator

retval_check.h

/**
 * Handy meta-macro to simplify repetitive error checking for APIs where every function returns
 * an error code (e.g. CUDA, C11 threads, most of the Windows API, etc.)
 *
 * Example usage:
 *     #define CUDA_CHECK(expr) RETVAL_CHECK(cudaSuccess, expr)
 *     ...
 *     CUDA_CHECK( cudaMemcpy(dst, src, size, cudaMemcpyHostToDevice) );
 *
 * To disable the checks in release builds, just redefine the macro:
 *     #define CUDA_CHECK(expr) expr
 *
 * As written, it's Visual C++ specific, but don't let that stop you!
 */
#define RETVAL_CHECK(expected, expr) do { \
		int err = (expr); \
		if (err != (expected)) { \
			printf("%s(%d): error in %s() -- %s returned %d\n", __FILE__, __LINE__, __FUNCTION__, #expr, err); \
			__debugbreak(); \
		} \
		assert(err == (expected)); \
		__pragma(warning(push)) \
		__pragma(warning(disable:4127)) \
	} while(0) \
	__pragma(warning(pop))