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/* Copyright (C) 2015 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INCLUDED_SCRIPTVAL
#define INCLUDED_SCRIPTVAL
#include "ScriptTypes.h"
/**
* A default constructible wrapper around JS::PersistentRootedValue
*
* It's a very common case that we need to store JS::Values on the heap as
* class members and only need them conditionally or want to initialize
* them after the constructor because we don't have the runtime available yet.
* Use it in these cases, but prefer to use JS::PersistentRootedValue directly
* if initializing it with a runtime/context in the constructor isn't a problem.
*/
template <typename T>
class DefPersistentRooted
{
public:
DefPersistentRooted()
{
}
DefPersistentRooted(JSRuntime* rt)
{
m_Val.reset(new JS::PersistentRooted<T>(rt));
}
DefPersistentRooted(JSRuntime* rt, JS::HandleValue val)
{
m_Val.reset(new JS::PersistentRooted<T>(rt, val));
}
DefPersistentRooted(JSContext* cx, JS::Handle<T> val)
{
m_Val.reset(new JS::PersistentRooted<T>(cx, val));
}
void clear()
{
m_Val = nullptr;
}
inline bool uninitialized()
{
return m_Val == nullptr;
}
inline JS::PersistentRooted<T>& get() const
{
ENSURE(m_Val);
return *m_Val;
}
inline void set(JSRuntime* rt, T val)
{
m_Val.reset(new JS::PersistentRooted<T>(rt, val));
}
inline void set(JSContext* cx, T val)
{
m_Val.reset(new JS::PersistentRooted<T>(cx, val));
}
// TODO: Move assignment operator and move constructor only have to be
// explicitly defined for Visual Studio. VS2013 is still behind on C++11 support
// What's missing is what they call "Rvalue references v3.0", see
// https://msdn.microsoft.com/en-us/library/hh567368.aspx#rvref
DefPersistentRooted<T>& operator=(DefPersistentRooted<T>&& other)
{
m_Val = std::move(other.m_Val);
return *this;
}
DefPersistentRooted<T>(DefPersistentRooted<T>&& other)
{
m_Val = std::move(other.m_Val);
}
private:
std::unique_ptr<JS::PersistentRooted<T> > m_Val;
};
#endif // INCLUDED_SCRIPTVAL
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