Source file test/typeparam/issue48716.dir/a.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  package a
     6  
     7  type Pair[L, R any] struct {
     8  	L L
     9  	R R
    10  }
    11  
    12  func Two[L, R any](l L, r R) Pair[L, R] {
    13  	return Pair[L, R]{L: l, R: r}
    14  }
    15  
    16  type Map[K, V any] interface {
    17  	Put(K, V)
    18  	Len() int
    19  	Iterate(func(Pair[K, V]) bool)
    20  }
    21  
    22  type HashMap[K comparable, V any] struct {
    23  	m map[K]V
    24  }
    25  
    26  func NewHashMap[K comparable, V any](capacity int) HashMap[K, V] {
    27  	var m map[K]V
    28  	if capacity >= 1 {
    29  		m = make(map[K]V, capacity)
    30  	} else {
    31  		m = map[K]V{}
    32  	}
    33  
    34  	return HashMap[K, V]{m: m}
    35  }
    36  
    37  func (m HashMap[K, V]) Put(k K, v V) {
    38  	m.m[k] = v
    39  }
    40  
    41  func (m HashMap[K, V]) Len() int {
    42  	return len(m.m)
    43  }
    44  
    45  func (m HashMap[K, V]) Iterate(cb func(Pair[K, V]) bool) {
    46  	for k, v := range m.m {
    47  		if !cb(Two(k, v)) {
    48  			return
    49  		}
    50  	}
    51  }
    52  

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