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Russ Cox authored
#pragma varargck countpos f 1 says that the first argument to f is the count of variadic arguments that follow. #pragma varargck type f t says that t is one of the allowed types for a variadic argument to f. (can be repeated) combined, these can be used to check the runtime.stdcall functions in the windows port or in any other port that needs a vararg list of uintptrs even on a 64-bit platform (where it is very easy to pass a less-than-uintptr in the ...). demo: typedef unsigned int uintptr; #pragma varargck countpos f 1 #pragma varargck type f uintptr #pragma varargck type f void* int f(int count, ...); void *v; char *p; void main(void) { f(1, v); // ok f(1, main); // ok f(1, p); // ok f(2, v, v); // ok f(2, v); // found 1 argument after count 2 f(1, 'a'); // invalid type INT in call to f f(1, 0); // invalid type INT in call to f } R=ken, r, alex.brainman CC=golang-dev https://golang.org/cl/4634103
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