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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_CPP_MODULE_IMPL_H_
#define PPAPI_CPP_MODULE_IMPL_H_
#include "ppapi/cpp/module.h"
namespace {
template <typename T> class DeviceFuncs {
public:
explicit DeviceFuncs(const char* ifname) : ifname_(ifname), funcs_(NULL) {}
operator T const*() {
if (!funcs_) {
funcs_ = reinterpret_cast<T const*>(
pp::Module::Get()->GetBrowserInterface(ifname_));
}
return funcs_;
}
// This version doesn't check for existence of the function object. It is
// used so that, for DeviceFuncs f, the expression:
// if (f) f->doSomething();
// checks the existence only once.
T const* operator->() const { return funcs_; }
private:
DeviceFuncs(const DeviceFuncs&other);
DeviceFuncs &operator=(const DeviceFuncs &other);
const char* ifname_;
T const* funcs_;
};
} // namespace
#endif // PPAPI_CPP_MODULE_IMPL_H_
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