1758e88fd9
http://ppapi.googlecode.com/ TEST=none BUG=none git-svn-id: svn://svn.chromium.org/chrome/trunk/src@64613 0039d316-1c4b-4281-b951-d872f2087c98
42 lines
1.0 KiB
C++
42 lines
1.0 KiB
C++
// Copyright (c) 2010 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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#ifndef PPAPI_CPP_MODULE_IMPL_H_
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#define PPAPI_CPP_MODULE_IMPL_H_
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#include "ppapi/cpp/module.h"
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namespace {
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template <typename T> class DeviceFuncs {
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public:
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explicit DeviceFuncs(const char* ifname) : ifname_(ifname), funcs_(NULL) {}
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operator T const*() {
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if (!funcs_) {
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funcs_ = reinterpret_cast<T const*>(
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pp::Module::Get()->GetBrowserInterface(ifname_));
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}
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return funcs_;
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}
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// This version doesn't check for existence of the function object. It is
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// used so that, for DeviceFuncs f, the expression:
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// if (f) f->doSomething();
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// checks the existence only once.
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T const* operator->() const { return funcs_; }
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private:
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DeviceFuncs(const DeviceFuncs&other);
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DeviceFuncs &operator=(const DeviceFuncs &other);
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const char* ifname_;
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T const* funcs_;
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};
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} // namespace
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#endif // PPAPI_CPP_MODULE_IMPL_H_
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