51 lines
1.5 KiB
Plaintext
51 lines
1.5 KiB
Plaintext
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/callback.h"
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namespace base {
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class Parent {
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};
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class Child : Parent {
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};
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#if defined(NCTEST_EQUALS_REQUIRES_SAMETYPE) // [r"no matching function for call to 'base::Callback<void\(\)>::Equals\(base::Callback<int\(\)>&\)'"]
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// Attempting to call comparison function on two callbacks of different type.
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//
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// This should be a compile time failure because each callback type should be
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// considered distinct.
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void WontCompile() {
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Closure c1;
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Callback<int(void)> c2;
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c1.Equals(c2);
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}
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#elif defined(NCTEST_CONSTRUCTION_FROM_SUBTYPE) // [r"conversion from 'base::Callback<base::Parent\(\)>' to non-scalar type 'base::Callback<base::Child\(\)>'"]
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// Construction of Callback<A> from Callback<B> if A is supertype of B.
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//
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// While this is technically safe, most people aren't used to it when coding
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// C++ so if this is happening, it is almost certainly an error.
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void WontCompile() {
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Callback<Parent(void)> cb_a;
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Callback<Child(void)> cb_b = cb_a;
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}
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#elif defined(NCTEST_ASSIGNMENT_FROM_SUBTYPE) // [r"no match for 'operator=' in 'cb_a = cb_b'"]
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// Assignment of Callback<A> from Callback<B> if A is supertype of B.
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// See explanation for NCTEST_CONSTRUCTION_FROM_SUBTYPE
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void WontCompile() {
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Callback<Parent(void)> cb_a;
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Callback<Child(void)> cb_b;
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cb_a = cb_b;
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}
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#endif
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} // namespace base
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