go id 源码
golang id 代码
文件路径：/src/cmd/compile/internal/ssa/id.go
// Copyright 2015 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.
package ssa
type ID int32
// idAlloc provides an allocator for unique integers.
type idAlloc struct {
last ID
}
// get allocates an ID and returns it. IDs are always > 0.
func (a *idAlloc) get() ID {
x := a.last
x++
if x == 1<<31-1 {
panic("too many ids for this function")
}
a.last = x
return x
}
// num returns the maximum ID ever returned + 1.
func (a *idAlloc) num() int {
return int(a.last + 1)
}
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