mirror of
https://github.com/golang/go
synced 2024-11-19 02:24:41 -07:00
52 lines
946 B
Go
52 lines
946 B
Go
// +build ignore
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package main
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// Test of maps.
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var a, b, c int
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func maps1() {
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m1 := map[*int]*int{&a: &b} // @line m1m1
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m2 := make(map[*int]*int) // @line m1m2
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m2[&b] = &a
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print(m1[nil]) // @pointsto main.b | main.c
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print(m2[nil]) // @pointsto main.a
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print(m1) // @pointsto makemap@m1m1:21
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print(m2) // @pointsto makemap@m1m2:12
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m1[&b] = &c
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for k, v := range m1 {
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print(k) // @pointsto main.a | main.b
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print(v) // @pointsto main.b | main.c
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}
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for k, v := range m2 {
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print(k) // @pointsto main.b
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print(v) // @pointsto main.a
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}
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// Lookup doesn't create any aliases.
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print(m2[&c]) // @pointsto main.a
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if _, ok := m2[&a]; ok {
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print(m2[&c]) // @pointsto main.a
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}
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}
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func maps2() {
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m1 := map[*int]*int{&a: &b}
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m2 := map[*int]*int{&b: &c}
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_ = []map[*int]*int{m1, m2} // (no spurious merging of m1, m2)
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print(m1[nil]) // @pointsto main.b
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print(m2[nil]) // @pointsto main.c
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}
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func main() {
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maps1()
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maps2()
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}
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