// run
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test simple boolean and numeric constants.
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package main
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import "os"
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const (
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c0 = 0
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cm1 = -1
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chuge = 1 << 100
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chuge_1 = chuge - 1
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c1 = chuge >> 100
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c3div2 = 3 / 2
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c1e3 = 1e3
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rsh1 = 1e100 >> 1000
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rsh2 = 1e302 >> 1000
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ctrue = true
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cfalse = !ctrue
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)
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const (
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f0 = 0.0
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fm1 = -1.
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fhuge float64 = 1 << 100
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fhuge_1 float64 = chuge - 1
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f1 float64 = chuge >> 100
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f3div2 = 3. / 2.
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f1e3 float64 = 1e3
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)
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func assert(t bool, s string) {
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if !t {
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panic(s)
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}
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}
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func ints() {
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assert(c0 == 0, "c0")
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assert(c1 == 1, "c1")
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assert(chuge > chuge_1, "chuge")
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assert(chuge_1+1 == chuge, "chuge 1")
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assert(chuge+cm1+1 == chuge, "cm1")
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assert(c3div2 == 1, "3/2")
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assert(c1e3 == 1000, "c1e3 int")
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assert(c1e3 == 1e3, "c1e3 float")
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assert(rsh1 == 0, "rsh1")
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assert(rsh2 == 9, "rsh2")
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// verify that all (in range) are assignable as ints
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var i int
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i = c0
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assert(i == c0, "i == c0")
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i = cm1
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assert(i == cm1, "i == cm1")
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i = c1
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assert(i == c1, "i == c1")
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i = c3div2
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assert(i == c3div2, "i == c3div2")
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i = c1e3
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assert(i == c1e3, "i == c1e3")
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// verify that all are assignable as floats
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var f float64
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f = c0
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assert(f == c0, "f == c0")
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f = cm1
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assert(f == cm1, "f == cm1")
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f = chuge
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assert(f == chuge, "f == chuge")
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f = chuge_1
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assert(f == chuge_1, "f == chuge_1")
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f = c1
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assert(f == c1, "f == c1")
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f = c3div2
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assert(f == c3div2, "f == c3div2")
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f = c1e3
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assert(f == c1e3, "f == c1e3")
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}
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func floats() {
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assert(f0 == c0, "f0")
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assert(f1 == c1, "f1")
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// TODO(gri): exp/ssa/interp constant folding is incorrect.
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if os.Getenv("GOSSAINTERP") == "" {
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assert(fhuge == fhuge_1, "fhuge") // float64 can't distinguish fhuge, fhuge_1.
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}
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assert(fhuge_1+1 == fhuge, "fhuge 1")
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assert(fhuge+fm1+1 == fhuge, "fm1")
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assert(f3div2 == 1.5, "3./2.")
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assert(f1e3 == 1000, "f1e3 int")
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assert(f1e3 == 1.e3, "f1e3 float")
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// verify that all (in range) are assignable as ints
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var i int
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i = f0
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assert(i == f0, "i == f0")
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i = fm1
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assert(i == fm1, "i == fm1")
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// verify that all are assignable as floats
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var f float64
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f = f0
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assert(f == f0, "f == f0")
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f = fm1
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assert(f == fm1, "f == fm1")
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f = fhuge
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assert(f == fhuge, "f == fhuge")
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f = fhuge_1
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assert(f == fhuge_1, "f == fhuge_1")
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f = f1
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assert(f == f1, "f == f1")
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f = f3div2
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assert(f == f3div2, "f == f3div2")
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f = f1e3
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assert(f == f1e3, "f == f1e3")
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}
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func interfaces() {
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var (
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nilN interface{}
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nilI *int
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five = 5
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_ = nil == interface{}(nil)
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_ = interface{}(nil) == nil
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)
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ii := func(i1 interface{}, i2 interface{}) bool { return i1 == i2 }
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ni := func(n interface{}, i int) bool { return n == i }
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in := func(i int, n interface{}) bool { return i == n }
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pi := func(p *int, i interface{}) bool { return p == i }
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ip := func(i interface{}, p *int) bool { return i == p }
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assert((interface{}(nil) == interface{}(nil)) == ii(nilN, nilN),
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"for interface{}==interface{} compiler == runtime")
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assert(((*int)(nil) == interface{}(nil)) == pi(nilI, nilN),
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"for *int==interface{} compiler == runtime")
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assert((interface{}(nil) == (*int)(nil)) == ip(nilN, nilI),
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"for interface{}==*int compiler == runtime")
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assert((&five == interface{}(nil)) == pi(&five, nilN),
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"for interface{}==*int compiler == runtime")
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assert((interface{}(nil) == &five) == ip(nilN, &five),
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"for interface{}==*int compiler == runtime")
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assert((5 == interface{}(5)) == ni(five, five),
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"for int==interface{} compiler == runtime")
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assert((interface{}(5) == 5) == in(five, five),
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"for interface{}==int comipiler == runtime")
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}
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func main() {
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ints()
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floats()
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interfaces()
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assert(ctrue == true, "ctrue == true")
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assert(cfalse == false, "cfalse == false")
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}
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