This is a very trivial demo that shows the basic usage of cgo.

README.md

This is a very trivial demo that shows the basic usage of cgo.

Build and Run:

$ go build main.go
$ ./main
hello, cgo
3

add.c

#include <stdio.h>
#include "add.h"

void Hello() {
    printf("hello, cgo\n");
}

int Add(int a, int b) {
    return a + b;
}

add.go

package add

// #include "add.h"
import "C"

func Hello() {
    C.Hello()
}

func Add(a, b int) (c int) {
    c = int(C.Add(C.int(a), C.int(b)))
    return
}

add.h

extern void Hello();
extern int Add(int, int);

main.go

// +build ignore

package main

import (
    "."
    "fmt"
)

func main() {
    add.Hello();
    fmt.Println(add.Add(1, 2))
}