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109 lines
3.4 KiB
C++
109 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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/TypeTraits.h"
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using mozilla::IsBaseOf;
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using mozilla::IsConvertible;
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namespace CPlusPlus11IsBaseOf {
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// Adapted from C++11 ยง 20.9.6.
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struct B {};
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struct B1 : B {};
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struct B2 : B {};
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struct D : private B1, private B2 {};
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static void
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StandardIsBaseOfTests()
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{
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MOZ_ASSERT((IsBaseOf<B, D>::value) == true);
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MOZ_ASSERT((IsBaseOf<const B, D>::value) == true);
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MOZ_ASSERT((IsBaseOf<B, const D>::value) == true);
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MOZ_ASSERT((IsBaseOf<B, const B>::value) == true);
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MOZ_ASSERT((IsBaseOf<D, B>::value) == false);
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MOZ_ASSERT((IsBaseOf<B&, D&>::value) == false);
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MOZ_ASSERT((IsBaseOf<B[3], D[3]>::value) == false);
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// We fail at the following test. To fix it, we need to specialize IsBaseOf
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// for all built-in types.
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// MOZ_ASSERT((IsBaseOf<int, int>::value) == false);
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}
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} /* namespace CPlusPlus11IsBaseOf */
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class A { };
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class B : public A { };
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class C : private A { };
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class D { };
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class E : public A { };
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class F : public B, public E { };
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static void
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TestIsBaseOf()
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{
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MOZ_ASSERT((IsBaseOf<A, B>::value),
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"A is a base of B");
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MOZ_ASSERT((!IsBaseOf<B, A>::value),
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"B is not a base of A");
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MOZ_ASSERT((IsBaseOf<A, C>::value),
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"A is a base of C");
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MOZ_ASSERT((!IsBaseOf<C, A>::value),
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"C is not a base of A");
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MOZ_ASSERT((IsBaseOf<A, F>::value),
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"A is a base of F");
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MOZ_ASSERT((!IsBaseOf<F, A>::value),
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"F is not a base of A");
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MOZ_ASSERT((!IsBaseOf<A, D>::value),
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"A is not a base of D");
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MOZ_ASSERT((!IsBaseOf<D, A>::value),
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"D is not a base of A");
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MOZ_ASSERT((IsBaseOf<B, B>::value),
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"B is the same as B (and therefore, a base of B)");
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}
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static void
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TestIsConvertible()
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{
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// Pointer type convertibility
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MOZ_ASSERT((IsConvertible<A*, A*>::value),
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"A* should convert to A*");
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MOZ_ASSERT((IsConvertible<B*, A*>::value),
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"B* should convert to A*");
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MOZ_ASSERT((!IsConvertible<A*, B*>::value),
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"A* shouldn't convert to B*");
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MOZ_ASSERT((!IsConvertible<A*, C*>::value),
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"A* shouldn't convert to C*");
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MOZ_ASSERT((!IsConvertible<A*, D*>::value),
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"A* shouldn't convert to unrelated D*");
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MOZ_ASSERT((!IsConvertible<D*, A*>::value),
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"D* shouldn't convert to unrelated A*");
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// Instance type convertibility
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MOZ_ASSERT((IsConvertible<A, A>::value),
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"A is A");
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MOZ_ASSERT((IsConvertible<B, A>::value),
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"B converts to A");
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MOZ_ASSERT((!IsConvertible<D, A>::value),
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"D and A are unrelated");
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MOZ_ASSERT((!IsConvertible<A, D>::value),
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"A and D are unrelated");
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// These cases seem to require C++11 support to properly implement them, so
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// for now just disable them.
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//MOZ_ASSERT((!IsConvertible<C*, A*>::value),
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// "C* shouldn't convert to A* (private inheritance)");
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//MOZ_ASSERT((!IsConvertible<C, A>::value),
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// "C doesn't convert to A (private inheritance)");
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}
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int
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main()
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{
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CPlusPlus11IsBaseOf::StandardIsBaseOfTests();
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TestIsBaseOf();
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TestIsConvertible();
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}
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