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93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=99 ft=cpp:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Code.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyrigght (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef mozilla_Util_h_
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#define mozilla_Util_h_
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namespace mozilla {
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/**
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* DebugOnly contains a value of type T, but only in debug builds. In
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* release builds, it does not contain a value. This helper is
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* intended to be used along with ASSERT()-style macros, allowing one
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* to write
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*
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* DebugOnly<bool> check = Func();
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* ASSERT(check);
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*
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* more concisely than declaring |check| conditional on #ifdef DEBUG,
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* but also without allocating storage space for |check| in release
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* builds.
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*
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* DebugOnly instances can only be coerced to T in debug builds; in
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* release builds, they don't have a value so type coercion is not
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* well defined.
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*/
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template <typename T>
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struct DebugOnly
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{
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#ifdef DEBUG
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T value;
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DebugOnly() {}
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DebugOnly(const T& other) : value(other) {}
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DebugOnly& operator=(const T& rhs) {
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value = rhs;
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return *this;
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}
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operator T&() { return value; }
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operator const T&() const { return value; }
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#else
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DebugOnly() {}
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DebugOnly(const T&) {}
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DebugOnly& operator=(const T&) {}
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#endif
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// DebugOnly must always have a destructor or else it will
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// generate "unused variable" warnings, exactly what it's intended
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// to avoid!
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~DebugOnly() {}
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};
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} // namespace mozilla
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#endif // mozilla_Util_h_
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