go/test/chancap.go

// run

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test the cap predeclared function applied to channels.

package main

func main() {
	c := make(chan int, 10)
	if len(c) != 0 || cap(c) != 10 {
		println("chan len/cap ", len(c), cap(c), " want 0 10")
		panic("fail")
	}

	for i := 0; i < 3; i++ {
		c <- i
	}
	if len(c) != 3 || cap(c) != 10 {
		println("chan len/cap ", len(c), cap(c), " want 3 10")
		panic("fail")
	}

	c = make(chan int)
	if len(c) != 0 || cap(c) != 0 {
		println("chan len/cap ", len(c), cap(c), " want 0 0")
		panic("fail")
	}
}