зеркало из https://github.com/mozilla/gecko-dev.git
116 строки
2.3 KiB
C++
116 строки
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Assertions.h"
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#include "mozilla/Function.h"
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using mozilla::function;
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#define CHECK(c) \
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do { \
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bool cond = !!(c); \
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MOZ_RELEASE_ASSERT(cond, "Failed assertion: " #c); \
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} while (false)
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struct ConvertibleToInt
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{
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operator int() const { return 42; }
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};
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int increment(int arg) { return arg + 1; }
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struct S {
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S() {}
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static int increment(int arg) { return arg + 1; }
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int decrement(int arg) { return arg - 1;}
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int sum(int arg1, int arg2) const { return arg1 + arg2;}
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};
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struct Incrementor {
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int operator()(int arg) { return arg + 1; }
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};
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static void
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TestNonmemberFunction()
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{
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function<int(int)> f = &increment;
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CHECK(f(42) == 43);
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}
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static void
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TestStaticMemberFunction()
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{
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function<int(int)> f = &S::increment;
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CHECK(f(42) == 43);
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}
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static void
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TestFunctionObject()
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{
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function<int(int)> f = Incrementor();
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CHECK(f(42) == 43);
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}
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static void
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TestLambda()
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{
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// Test non-capturing lambda
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function<int(int)> f = [](int arg){ return arg + 1; };
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CHECK(f(42) == 43);
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// Test capturing lambda
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int one = 1;
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function<int(int)> g = [one](int arg){ return arg + one; };
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CHECK(g(42) == 43);
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}
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static void
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TestDefaultConstructionAndAssignmentLater()
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{
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function<int(int)> f; // allowed
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// Would get an assertion if we tried calling f now.
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f = &increment;
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CHECK(f(42) == 43);
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}
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static void
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TestReassignment()
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{
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function<int(int)> f = &increment;
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CHECK(f(42) == 43);
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f = [](int arg){ return arg + 2; };
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CHECK(f(42) == 44);
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}
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static void
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TestMemberFunction()
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{
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function<int(S&, int)> f = &S::decrement;
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S s;
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CHECK((f(s, 1) == 0));
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}
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static void
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TestConstMemberFunction()
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{
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function<int(const S*, int, int)> f = &S::sum;
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const S s;
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CHECK((f(&s, 1, 1) == 2));
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}
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int
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main()
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{
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TestNonmemberFunction();
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TestStaticMemberFunction();
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TestFunctionObject();
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TestLambda();
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TestDefaultConstructionAndAssignmentLater();
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TestReassignment();
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TestMemberFunction();
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TestConstMemberFunction();
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return 0;
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}
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