gophercon-2018 | Code companion for Gophercon

package main

// #include 
// int64_t f(int64_t a, int64_t b, int64_t c, int64_t d) {return a+b+c+d; }
import "C"
import (
    "fmt"
    "math/rand"
    "time"
)

func f(a, b, c, d int64) int64 {
    return a + b + c + d
}

func main() {

    start := time.Now()
    for i := 1; i < 2000; i++ {
        a, b, c, d := rand.Int63(), rand.Int63(), rand.Int63(), rand.Int63()
        ans_c := int64(C.f((C.int64_t)(a), (C.int64_t)(b), (C.int64_t)(c), (C.int64_t)(d)))
        ans_c = ans_c
    }
    fmt.Printf("cgo time %v\n", time.Since(start))

    start = time.Now()
    for i := 1; i < 2000; i++ {
        a, b, c, d := rand.Int63(), rand.Int63(), rand.Int63(), rand.Int63()
        ans_go := f(a, b, c, d)
        ans_go = ans_go
    }
    fmt.Printf("go time %v\n", time.Since(start))
}