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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:19:13 +0000 |
commit | ccd992355df7192993c666236047820244914598 (patch) | |
tree | f00fea65147227b7743083c6148396f74cd66935 /test/interface/convert.go | |
parent | Initial commit. (diff) | |
download | golang-1.21-ccd992355df7192993c666236047820244914598.tar.xz golang-1.21-ccd992355df7192993c666236047820244914598.zip |
Adding upstream version 1.21.8.upstream/1.21.8
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'test/interface/convert.go')
-rw-r--r-- | test/interface/convert.go | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/test/interface/convert.go b/test/interface/convert.go new file mode 100644 index 0000000..eb6fd1d --- /dev/null +++ b/test/interface/convert.go @@ -0,0 +1,146 @@ +// run + +// Copyright 2009 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. + +// Test all the different interface conversion runtime functions. + +package main + +type Stringer interface { + String() string +} +type StringLengther interface { + String() string + Length() int +} +type Empty interface{} + +type T string + +func (t T) String() string { + return string(t) +} +func (t T) Length() int { + return len(t) +} + +type U string + +func (u U) String() string { + return string(u) +} + +var t = T("hello") +var u = U("goodbye") +var e Empty +var s Stringer = t +var sl StringLengther = t +var i int +var ok bool + +func hello(s string) { + if s != "hello" { + println("not hello: ", s) + panic("fail") + } +} + +func five(i int) { + if i != 5 { + println("not 5: ", i) + panic("fail") + } +} + +func true(ok bool) { + if !ok { + panic("not true") + } +} + +func false(ok bool) { + if ok { + panic("not false") + } +} + +func main() { + // T2I + s = t + hello(s.String()) + + // I2T + t = s.(T) + hello(t.String()) + + // T2E + e = t + + // E2T + t = e.(T) + hello(t.String()) + + // T2I again + sl = t + hello(sl.String()) + five(sl.Length()) + + // I2I static + s = sl + hello(s.String()) + + // I2I dynamic + sl = s.(StringLengther) + hello(sl.String()) + five(sl.Length()) + + // I2E (and E2T) + e = s + hello(e.(T).String()) + + // E2I + s = e.(Stringer) + hello(s.String()) + + // I2T2 true + t, ok = s.(T) + true(ok) + hello(t.String()) + + // I2T2 false + _, ok = s.(U) + false(ok) + + // I2I2 true + sl, ok = s.(StringLengther) + true(ok) + hello(sl.String()) + five(sl.Length()) + + // I2I2 false (and T2I) + s = u + sl, ok = s.(StringLengther) + false(ok) + + // E2T2 true + t, ok = e.(T) + true(ok) + hello(t.String()) + + // E2T2 false + i, ok = e.(int) + false(ok) + + // E2I2 true + sl, ok = e.(StringLengther) + true(ok) + hello(sl.String()) + five(sl.Length()) + + // E2I2 false (and T2E) + e = u + sl, ok = e.(StringLengther) + false(ok) +} |