closure_test.go

Documentation: runtime

		 1  // Copyright 2011 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 runtime_test
		 6  
		 7  import "testing"
		 8  
		 9  var s int
		10  
		11  func BenchmarkCallClosure(b *testing.B) {
		12  	for i := 0; i < b.N; i++ {
		13  		s += func(ii int) int { return 2 * ii }(i)
		14  	}
		15  }
		16  
		17  func BenchmarkCallClosure1(b *testing.B) {
		18  	for i := 0; i < b.N; i++ {
		19  		j := i
		20  		s += func(ii int) int { return 2*ii + j }(i)
		21  	}
		22  }
		23  
		24  var ss *int
		25  
		26  func BenchmarkCallClosure2(b *testing.B) {
		27  	for i := 0; i < b.N; i++ {
		28  		j := i
		29  		s += func() int {
		30  			ss = &j
		31  			return 2
		32  		}()
		33  	}
		34  }
		35  
		36  func addr1(x int) *int {
		37  	return func() *int { return &x }()
		38  }
		39  
		40  func BenchmarkCallClosure3(b *testing.B) {
		41  	for i := 0; i < b.N; i++ {
		42  		ss = addr1(i)
		43  	}
		44  }
		45  
		46  func addr2() (x int, p *int) {
		47  	return 0, func() *int { return &x }()
		48  }
		49  
		50  func BenchmarkCallClosure4(b *testing.B) {
		51  	for i := 0; i < b.N; i++ {
		52  		_, ss = addr2()
		53  	}
		54  }
		55
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