Golang Cgo是什么

package main

/*

#include <stdint.h>

static int32_t add(int32_t a, int32_t b) {

    return a + b;

}

*/

import "C"

import "fmt"

func main() {

    var a, b int32 = 1, 2

    var c int32 = int32(C.add(C.int32_t(a), C.int32_t(b)))

    fmt.Println(c) // 3

}