go tuple 源码
golang tuple 代码
文件路径：/src/go/types/tuple.go
// Copyright 2011 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 types
// A Tuple represents an ordered list of variables; a nil *Tuple is a valid (empty) tuple.
// Tuples are used as components of signatures and to represent the type of multiple
// assignments; they are not first class types of Go.
type Tuple struct {
vars []*Var
}
// NewTuple returns a new tuple for the given variables.
func NewTuple(x ...*Var) *Tuple {
if len(x) > 0 {
return &Tuple{vars: x}
}
return nil
}
// Len returns the number variables of tuple t.
func (t *Tuple) Len() int {
if t != nil {
return len(t.vars)
}
return 0
}
// At returns the i'th variable of tuple t.
func (t *Tuple) At(i int) *Var { return t.vars[i] }
func (t *Tuple) Underlying() Type { return t }
func (t *Tuple) String() string { return TypeString(t, nil) }
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