compilersupport.go

     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  
     8  package types2
     9  
    10  // If t is a pointer, AsPointer returns that type, otherwise it returns nil.
    11  func AsPointer(t Type) *Pointer {
    12  	u, _ := t.Underlying().(*Pointer)
    13  	return u
    14  }
    15  
    16  // If typ is a type parameter, CoreType returns the single underlying
    17  // type of all types in the corresponding type constraint if it exists, or
    18  // nil otherwise. If the type set contains only unrestricted and restricted
    19  // channel types (with identical element types), the single underlying type
    20  // is the restricted channel type if the restrictions are always the same.
    21  // If typ is not a type parameter, CoreType returns the underlying type.
    22  func CoreType(t Type) Type {
    23  	u, _ := commonUnder(t, nil)
    24  	return u
    25  }
    26  
    27  // RangeKeyVal returns the key and value types for a range over typ.
    28  // It panics if range over typ is invalid.
    29  func RangeKeyVal(typ Type) (Type, Type) {
    30  	key, val, _, ok := rangeKeyVal(nil, typ, nil)
    31  	assert(ok)
    32  	return key, val
    33  }
    34
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