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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
commit | 43a123c1ae6613b3efeed291fa552ecd909d3acf (patch) | |
tree | fd92518b7024bc74031f78a1cf9e454b65e73665 /src/fmt/gostringer_example_test.go | |
parent | Initial commit. (diff) | |
download | golang-1.20-upstream.tar.xz golang-1.20-upstream.zip |
Adding upstream version 1.20.14.upstream/1.20.14upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/fmt/gostringer_example_test.go')
-rw-r--r-- | src/fmt/gostringer_example_test.go | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/fmt/gostringer_example_test.go b/src/fmt/gostringer_example_test.go new file mode 100644 index 0000000..ab19ee3 --- /dev/null +++ b/src/fmt/gostringer_example_test.go @@ -0,0 +1,59 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package fmt_test + +import ( + "fmt" +) + +// Address has a City, State and a Country. +type Address struct { + City string + State string + Country string +} + +// Person has a Name, Age and Address. +type Person struct { + Name string + Age uint + Addr *Address +} + +// GoString makes Person satisfy the GoStringer interface. +// The return value is valid Go code that can be used to reproduce the Person struct. +func (p Person) GoString() string { + if p.Addr != nil { + return fmt.Sprintf("Person{Name: %q, Age: %d, Addr: &Address{City: %q, State: %q, Country: %q}}", p.Name, int(p.Age), p.Addr.City, p.Addr.State, p.Addr.Country) + } + return fmt.Sprintf("Person{Name: %q, Age: %d}", p.Name, int(p.Age)) +} + +func ExampleGoStringer() { + p1 := Person{ + Name: "Warren", + Age: 31, + Addr: &Address{ + City: "Denver", + State: "CO", + Country: "U.S.A.", + }, + } + // If GoString() wasn't implemented, the output of `fmt.Printf("%#v", p1)` would be similar to + // Person{Name:"Warren", Age:0x1f, Addr:(*main.Address)(0x10448240)} + fmt.Printf("%#v\n", p1) + + p2 := Person{ + Name: "Theia", + Age: 4, + } + // If GoString() wasn't implemented, the output of `fmt.Printf("%#v", p2)` would be similar to + // Person{Name:"Theia", Age:0x4, Addr:(*main.Address)(nil)} + fmt.Printf("%#v\n", p2) + + // Output: + // Person{Name: "Warren", Age: 31, Addr: &Address{City: "Denver", State: "CO", Country: "U.S.A."}} + // Person{Name: "Theia", Age: 4} +} |