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649f04a48c
SqMod/include/sqrat/sqratAllocator.h
Sandu Liviu Catalin 649f04a48c Use variatic templates to simplify NoCopy allocator.
2018-10-31 20:14:19 +02:00

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//
// SqratAllocator: Custom Class Allocation/Deallocation
//
//
// Copyright (c) 2009 Brandon Jones
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
#if !defined(_SCRAT_ALLOCATOR_H_)
#define _SCRAT_ALLOCATOR_H_
#ifdef SQMOD_PLUGIN_API
#include <SqAPI.h>
#else
#include <squirrel.h>
#endif // SQMOD_PLUGIN_API
#include <string.h>
#include "sqratObject.h"
#include "sqratTypes.h"
namespace Sqrat {
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// @cond DEV
/// utility taken from http://stackoverflow.com/questions/2733377/is-there-a-way-to-test-whether-a-c-class-has-a-default-constructor-other-than/2770326#2770326
/// may be obsolete in C++ 11
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template< class T > using is_default_constructible = std::is_default_constructible<T>;
/// @endcond
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// DefaultAllocator is the allocator to use for Class that can both be constructed and copied
///
/// \tparam C Type of class
///
/// \remarks
/// There is mechanisms defined in this class that allow the Class::Ctor method to work properly (e.g. iNew).
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template<class C>
class DefaultAllocator {
template <class T, bool b>
struct NewC
{
T* p;
NewC()
{
p = new T();
}
};
template <class T>
struct NewC<T, false>
{
T* p;
NewC()
{
p = 0;
}
};
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Associates a newly created instance with an object allocated with the new operator (which is automatically deleted)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param ptr Should be the return value from a call to the new operator
///
/// \remarks
/// This function should only need to be used when custom constructors are bound with Class::SquirrelFunc.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static void SetInstance(HSQUIRRELVM vm, SQInteger idx, C* ptr)
{
ClassData<C>* cd = ClassType<C>::getClassData(vm);
sq_setinstanceup(vm, idx, new std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >(ptr, cd->instances));
sq_setreleasehook(vm, idx, &Delete);
sq_getstackobj(vm, idx, &((*cd->instances)[ptr]));
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up an instance on the stack for the template class
///
/// \param vm VM that has an instance object of the correct type at position 1 in its stack
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger New(HSQUIRRELVM vm) {
SetInstance(vm, 1, NewC<C, is_default_constructible<C>::value >().p);
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// @cond DEV
/// following iNew functions are used only if constructors are bound via Ctor() in Sqrat::Class (safe to ignore)
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger iNew(HSQUIRRELVM vm) {
return New(vm);
}
template <class... A>
static SQInteger iNew(HSQUIRRELVM vm) {
try {
SetInstance(vm, 1, ArgFwd<A...>{}.Call(vm, 2, [](HSQUIRRELVM /*vm*/, A... a) -> C * {
return new C(a...);
}));
} catch (const Exception& e) {
return sq_throwerror(vm, e.what());
} catch (...) {
return sq_throwerror(vm, _SC("unknown exception occured"));
}
return 0;
}
/// @endcond
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up the instance at idx on the stack as a copy of a value of the same type
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param value A pointer to data of the same type as the instance object
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Copy(HSQUIRRELVM vm, SQInteger idx, const void* value) {
SetInstance(vm, idx, new C(*static_cast<const C*>(value)));
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to delete an instance's data
///
/// \param ptr Pointer to the data contained by the instance
/// \param size Size of the data contained by the instance
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Delete(SQUserPointer ptr, SQInteger size) {
SQUNUSED(size);
std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >* instance = reinterpret_cast<std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >*>(ptr);
instance->second->erase(instance->first);
delete instance->first;
delete instance;
return 0;
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// NoConstructor is the allocator to use for Class that can NOT be constructed or copied
///
/// \tparam C Type of class
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template<class C>
class NoConstructor {
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Associates a newly created instance with an object allocated with the new operator (which is automatically deleted)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param ptr Should be the return value from a call to the new operator
///
/// \remarks
/// This function should only need to be used when custom constructors are bound with Class::SquirrelFunc.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static void SetInstance(HSQUIRRELVM vm, SQInteger idx, C* ptr)
{
ClassData<C>* cd = ClassType<C>::getClassData(vm);
sq_setinstanceup(vm, idx, new std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >(ptr, cd->instance));
sq_setreleasehook(vm, idx, &Delete);
sq_getstackobj(vm, idx, &((*cd->instances)[ptr]));
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up an instance on the stack for the template class (not allowed in this allocator)
///
/// \param vm VM that has an instance object of the correct type at position 1 in its stack
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger New(HSQUIRRELVM vm) {
#if !defined (SCRAT_NO_ERROR_CHECKING)
return sq_throwerror(vm, (ClassType<C>::ClassName() + string(_SC(" constructing is not allowed"))).c_str());
#else
SQUNUSED(vm);
return 0;
#endif
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up the instance at idx on the stack as a copy of a value of the same type (not used in this allocator)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param value A pointer to data of the same type as the instance object
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Copy(HSQUIRRELVM vm, SQInteger idx, const void* value) {
SQUNUSED(vm);
SQUNUSED(idx);
SQUNUSED(value);
return sq_throwerror(vm, (ClassType<C>::ClassName() + string(_SC(" cloning is not allowed"))).c_str());
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to delete an instance's data
///
/// \param ptr Pointer to the data contained by the instance
/// \param size Size of the data contained by the instance
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Delete(SQUserPointer ptr, SQInteger size) {
SQUNUSED(size);
std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >* instance = reinterpret_cast<std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >*>(ptr);
instance->second->erase(instance->first);
delete instance->first;
delete instance;
return 0;
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// NoDestructor is the allocator to use for Class that can NOT be constructed, copied or destructed
///
/// \tparam C Type of class
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template<class C>
class NoDestructor {
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Associates a newly created instance with an object allocated with the new operator (which is automatically deleted)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param ptr Should be the return value from a call to the new operator
///
/// \remarks
/// This function should only need to be used when custom constructors are bound with Class::SquirrelFunc.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static void SetInstance(HSQUIRRELVM vm, SQInteger idx, C* ptr)
{
ClassData<C>* cd = ClassType<C>::getClassData(vm);
sq_setinstanceup(vm, idx, new std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >(ptr, cd->instance));
sq_setreleasehook(vm, idx, &Delete);
sq_getstackobj(vm, idx, &((*cd->instances)[ptr]));
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up an instance on the stack for the template class (not allowed in this allocator)
///
/// \param vm VM that has an instance object of the correct type at position 1 in its stack
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger New(HSQUIRRELVM vm) {
#if !defined (SCRAT_NO_ERROR_CHECKING)
return sq_throwerror(vm, (ClassType<C>::ClassName() + string(_SC(" constructing is not allowed"))).c_str());
#else
SQUNUSED(vm);
return 0;
#endif
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up the instance at idx on the stack as a copy of a value of the same type (not used in this allocator)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param value A pointer to data of the same type as the instance object
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Copy(HSQUIRRELVM vm, SQInteger idx, const void* value) {
SQUNUSED(vm);
SQUNUSED(idx);
SQUNUSED(value);
return sq_throwerror(vm, (ClassType<C>::ClassName() + string(_SC(" cloning is not allowed"))).c_str());
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to delete an instance's data
///
/// \param ptr Pointer to the data contained by the instance
/// \param size Size of the data contained by the instance
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Delete(SQUserPointer ptr, SQInteger size) {
SQUNUSED(size);
std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >* instance = reinterpret_cast<std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >*>(ptr);
instance->second->erase(instance->first);
// Only delete our pair instance and leave the actual instance untouched
//delete instance->first;
delete instance;
return 0;
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// CopyOnly is the allocator to use for Class that can be copied but not constructed
///
/// \tparam C Type of class
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template<class C>
class CopyOnly {
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Associates a newly created instance with an object allocated with the new operator (which is automatically deleted)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param ptr Should be the return value from a call to the new operator
///
/// \remarks
/// This function should only need to be used when custom constructors are bound with Class::SquirrelFunc.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static void SetInstance(HSQUIRRELVM vm, SQInteger idx, C* ptr)
{
ClassData<C>* cd = ClassType<C>::getClassData(vm);
sq_setinstanceup(vm, idx, new std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >(ptr, cd->instances));
sq_setreleasehook(vm, idx, &Delete);
sq_getstackobj(vm, idx, &((*cd->instances)[ptr]));
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up an instance on the stack for the template class (not allowed in this allocator)
///
/// \param vm VM that has an instance object of the correct type at position 1 in its stack
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger New(HSQUIRRELVM vm) {
#if !defined (SCRAT_NO_ERROR_CHECKING)
return sq_throwerror(vm, (ClassType<C>::ClassName() + string(_SC(" constructing is not allowed"))).c_str());
#else
SQUNUSED(vm);
return 0;
#endif
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up the instance at idx on the stack as a copy of a value of the same type
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param value A pointer to data of the same type as the instance object
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Copy(HSQUIRRELVM vm, SQInteger idx, const void* value) {
SetInstance(vm, idx, new C(*static_cast<const C*>(value)));
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to delete an instance's data
///
/// \param ptr Pointer to the data contained by the instance
/// \param size Size of the data contained by the instance
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Delete(SQUserPointer ptr, SQInteger size) {
SQUNUSED(size);
std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >* instance = reinterpret_cast<std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >*>(ptr);
instance->second->erase(instance->first);
delete instance->first;
delete instance;
return 0;
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// NoCopy is the allocator to use for Class that can be constructed but not copied
///
/// \tparam C Type of class
///
/// \remarks
/// There is mechanisms defined in this class that allow the Class::Ctor method to work properly (e.g. iNew).
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template<class C>
class NoCopy {
template <class T, bool b>
struct NewC
{
T* p;
NewC()
{
p = new T();
}
};
template <class T>
struct NewC<T, false>
{
T* p;
NewC()
{
p = 0;
}
};
public:
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Associates a newly created instance with an object allocated with the new operator (which is automatically deleted)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param ptr Should be the return value from a call to the new operator
///
/// \remarks
/// This function should only need to be used when custom constructors are bound with Class::SquirrelFunc.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static void SetInstance(HSQUIRRELVM vm, SQInteger idx, C* ptr)
{
ClassData<C>* cd = ClassType<C>::getClassData(vm);
sq_setinstanceup(vm, idx, new std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >(ptr, cd->instances));
sq_setreleasehook(vm, idx, &Delete);
sq_getstackobj(vm, idx, &((*cd->instances)[ptr]));
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up an instance on the stack for the template class
///
/// \param vm VM that has an instance object of the correct type at position 1 in its stack
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger New(HSQUIRRELVM vm) {
SetInstance(vm, 1, NewC<C, is_default_constructible<C>::value >().p);
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// @cond DEV
/// following iNew functions are used only if constructors are bound via Ctor() in Sqrat::Class (safe to ignore)
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger iNew(HSQUIRRELVM vm) {
return New(vm);
}
template <class... A>
static SQInteger iNew(HSQUIRRELVM vm) {
try {
SetInstance(vm, 1, ArgFwd<A...>{}.Call(vm, 2, [](HSQUIRRELVM /*vm*/, A... a) -> C * {
return new C(a...);
}));
} catch (const Exception& e) {
return sq_throwerror(vm, e.what());
} catch (...) {
return sq_throwerror(vm, _SC("unknown exception occured"));
}
return 0;
}
/// @endcond
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to set up the instance at idx on the stack as a copy of a value of the same type (not used in this allocator)
///
/// \param vm VM that has an instance object of the correct type at idx
/// \param idx Index of the stack that the instance object is at
/// \param value A pointer to data of the same type as the instance object
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Copy(HSQUIRRELVM vm, SQInteger idx, const void* value) {
SQUNUSED(vm);
SQUNUSED(idx);
SQUNUSED(value);
return sq_throwerror(vm, (ClassType<C>::ClassName() + string(_SC(" cloning is not allowed"))).c_str());
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Called by Sqrat to delete an instance's data
///
/// \param ptr Pointer to the data contained by the instance
/// \param size Size of the data contained by the instance
///
/// \return Squirrel error code
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
static SQInteger Delete(SQUserPointer ptr, SQInteger size) {
SQUNUSED(size);
std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >* instance = reinterpret_cast<std::pair<C*, SharedPtr<typename unordered_map<C*, HSQOBJECT>::type> >*>(ptr);
instance->second->erase(instance->first);
delete instance->first;
delete instance;
return 0;
}
};
}
#endif
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