github.com/AndrienkoAleksandr/go@v0.0.19/src/go/parser/testdata/metrics.go2 (about)

     1  package metrics
     2  
     3  import "sync"
     4  
     5  type Metric1[T comparable] struct {
     6  	mu sync.Mutex
     7  	m  map[T]int
     8  }
     9  
    10  func (m *Metric1[T]) Add(v T) {
    11  	m.mu.Lock()
    12  	defer m.mu.Unlock()
    13  	if m.m == nil {
    14  		m.m = make(map[T]int)
    15  	}
    16  	m[v]++
    17  }
    18  
    19  type key2[T1, T2 comparable] struct {
    20  	f1 T1
    21  	f2 T2
    22  }
    23  
    24  type Metric2[T1, T2 cmp2] struct {
    25  	mu sync.Mutex
    26  	m  map[key2[T1, T2]]int
    27  }
    28  
    29  func (m *Metric2[T1, T2]) Add(v1 T1, v2 T2) {
    30  	m.mu.Lock()
    31  	defer m.mu.Unlock()
    32  	if m.m == nil {
    33  		m.m = make(map[key2[T1, T2]]int)
    34  	}
    35  	m[key[T1, T2]{v1, v2}]++
    36  }
    37  
    38  type key3[T1, T2, T3 comparable] struct {
    39  	f1 T1
    40  	f2 T2
    41  	f3 T3
    42  }
    43  
    44  type Metric3[T1, T2, T3 comparable] struct {
    45  	mu sync.Mutex
    46  	m  map[key3[T1, T2, T3]]int
    47  }
    48  
    49  func (m *Metric3[T1, T2, T3]) Add(v1 T1, v2 T2, v3 T3) {
    50  	m.mu.Lock()
    51  	defer m.mu.Unlock()
    52  	if m.m == nil {
    53  		m.m = make(map[key3]int)
    54  	}
    55  	m[key[T1, T2, T3]{v1, v2, v3}]++
    56  }
    57  
    58  // Repeat for the maximum number of permitted arguments.