int.go

// Copyright 2020 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package xrand

import (
	"math/rand"
	"time"
)

// Int63n implements rand.Int63n on the grpcrand global source.
func Int63n(n int64) int64 {
	mu.Lock()
	res := r.Int63n(n)
	mu.Unlock()
	return res
}

// Intn implements rand.Intn on the grpcrand global source.
func Intn(n int) int {
	mu.Lock()
	res := r.Intn(n)
	mu.Unlock()
	return res
}

// Float64 implements rand.Float64 on the grpcrand global source.
func Float64() float64 {
	mu.Lock()
	res := r.Float64()
	mu.Unlock()
	return res
}

// Shuffle ...
func Shuffle(length int, fn func(i, j int)) {
	xr := rand.New(rand.NewSource(time.Now().UnixNano()))
	xr.Shuffle(length, fn)
}