1// Copyright 2021 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// Helper functions exported for the compiler. 6// Do not use internally. 7 8package types2 9 10// If t is a pointer, AsPointer returns that type, otherwise it returns nil. 11func AsPointer(t Type) *Pointer { 12 u, _ := t.Underlying().(*Pointer) 13 return u 14} 15 16// If t is a signature, AsSignature returns that type, otherwise it returns nil. 17func AsSignature(t Type) *Signature { 18 u, _ := t.Underlying().(*Signature) 19 return u 20} 21 22// If typ is a type parameter, CoreType returns the single underlying 23// type of all types in the corresponding type constraint if it exists, or 24// nil otherwise. If the type set contains only unrestricted and restricted 25// channel types (with identical element types), the single underlying type 26// is the restricted channel type if the restrictions are always the same. 27// If typ is not a type parameter, CoreType returns the underlying type. 28func CoreType(t Type) Type { 29 return coreType(t) 30} 31