/*
|
Copyright 2007 Tobias Schwinger
|
|
Copyright 2019 Glen Joseph Fernandes
|
(glenjofe@gmail.com)
|
|
Distributed under the Boost Software License, Version 1.0.
|
(http://www.boost.org/LICENSE_1_0.txt)
|
*/
|
#ifndef BOOST_FUNCTIONAL_FACTORY_HPP
|
#define BOOST_FUNCTIONAL_FACTORY_HPP
|
|
#include <boost/config.hpp>
|
#include <boost/core/empty_value.hpp>
|
#include <boost/core/pointer_traits.hpp>
|
#include <boost/type_traits/remove_cv.hpp>
|
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
|
#include <memory>
|
#endif
|
#include <new>
|
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
|
!defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
|
#include <utility>
|
#endif
|
|
namespace boost {
|
|
enum factory_alloc_propagation {
|
factory_alloc_for_pointee_and_deleter,
|
factory_passes_alloc_to_smart_pointer
|
};
|
|
namespace detail {
|
|
template<factory_alloc_propagation>
|
struct fc_tag { };
|
|
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
|
template<class A, class T>
|
struct fc_rebind {
|
typedef typename std::allocator_traits<A>::template rebind_alloc<T> type;
|
};
|
|
template<class A>
|
struct fc_pointer {
|
typedef typename std::allocator_traits<A>::pointer type;
|
};
|
#else
|
template<class A, class T>
|
struct fc_rebind {
|
typedef typename A::template rebind<T>::other type;
|
};
|
|
template<class A>
|
struct fc_pointer {
|
typedef typename A::pointer type;
|
};
|
#endif
|
|
#if !defined(BOOST_NO_CXX11_ALLOCATOR) && \
|
!defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
|
!defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
|
template<class A, class T>
|
inline void
|
fc_destroy(A& a, T* p)
|
{
|
std::allocator_traits<A>::destroy(a, p);
|
}
|
#else
|
template<class A, class T>
|
inline void
|
fc_destroy(A&, T* p)
|
{
|
p->~T();
|
}
|
#endif
|
|
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
|
!defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
|
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
|
template<class A, class T, class... Args>
|
inline void
|
fc_construct(A& a, T* p, Args&&... args)
|
{
|
std::allocator_traits<A>::construct(a, p, std::forward<Args>(args)...);
|
}
|
#else
|
template<class A, class T, class... Args>
|
inline void
|
fc_construct(A&, T* p, Args&&... args)
|
{
|
::new((void*)p) T(std::forward<Args>(args)...);
|
}
|
#endif
|
#endif
|
|
template<class A>
|
class fc_delete
|
: boost::empty_value<A> {
|
typedef boost::empty_value<A> base;
|
|
public:
|
explicit fc_delete(const A& a) BOOST_NOEXCEPT
|
: base(boost::empty_init_t(), a) { }
|
|
void operator()(typename fc_pointer<A>::type p) {
|
boost::detail::fc_destroy(base::get(), boost::to_address(p));
|
base::get().deallocate(p, 1);
|
}
|
};
|
|
template<class R, class A>
|
class fc_allocate {
|
public:
|
explicit fc_allocate(const A& a)
|
: a_(a)
|
, p_(a_.allocate(1)) { }
|
|
~fc_allocate() {
|
if (p_) {
|
a_.deallocate(p_, 1);
|
}
|
}
|
|
A& state() BOOST_NOEXCEPT {
|
return a_;
|
}
|
|
typename A::value_type* get() const BOOST_NOEXCEPT {
|
return boost::to_address(p_);
|
}
|
|
R release(fc_tag<factory_alloc_for_pointee_and_deleter>) {
|
return R(release(), fc_delete<A>(a_), a_);
|
}
|
|
R release(fc_tag<factory_passes_alloc_to_smart_pointer>) {
|
return R(release(), fc_delete<A>(a_));
|
}
|
|
private:
|
typedef typename fc_pointer<A>::type pointer;
|
|
pointer release() BOOST_NOEXCEPT {
|
pointer p = p_;
|
p_ = pointer();
|
return p;
|
}
|
|
fc_allocate(const fc_allocate&);
|
fc_allocate& operator=(const fc_allocate&);
|
|
A a_;
|
pointer p_;
|
};
|
|
} /* detail */
|
|
template<class Pointer, class Allocator = void,
|
factory_alloc_propagation Policy = factory_alloc_for_pointee_and_deleter>
|
class factory;
|
|
template<class Pointer, factory_alloc_propagation Policy>
|
class factory<Pointer, void, Policy> {
|
public:
|
typedef typename remove_cv<Pointer>::type result_type;
|
|
private:
|
typedef typename pointer_traits<result_type>::element_type type;
|
|
public:
|
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
|
!defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
|
template<class... Args>
|
result_type operator()(Args&&... args) const {
|
return result_type(new type(std::forward<Args>(args)...));
|
}
|
#else
|
result_type operator()() const {
|
return result_type(new type());
|
}
|
|
template<class A0>
|
result_type operator()(A0& a0) const {
|
return result_type(new type(a0));
|
}
|
|
template<class A0, class A1>
|
result_type operator()(A0& a0, A1& a1) const {
|
return result_type(new type(a0, a1));
|
}
|
|
template<class A0, class A1, class A2>
|
result_type operator()(A0& a0, A1& a1, A2& a2) const {
|
return result_type(new type(a0, a1, a2));
|
}
|
|
template<class A0, class A1, class A2, class A3>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3) const {
|
return result_type(new type(a0, a1, a2, a3));
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4) const {
|
return result_type(new type(a0, a1, a2, a3, a4));
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4,
|
A5& a5) const {
|
return result_type(new type(a0, a1, a2, a3, a4, a5));
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5,
|
class A6>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4, A5& a5,
|
A6& a6) const {
|
return result_type(new type(a0, a1, a2, a3, a4, a5, a6));
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5,
|
class A6, class A7>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4, A5& a5,
|
A6& a6, A7& a7) const {
|
return result_type(new type(a0, a1, a2, a3, a4, a5, a6, a7));
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5,
|
class A6, class A7, class A8>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4, A5& a5,
|
A6& a6, A7& a7, A8& a8) const {
|
return result_type(new type(a0, a1, a2, a3, a4, a5, a6, a7, a8));
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5,
|
class A6, class A7, class A8, class A9>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4, A5& a5,
|
A6& a6, A7& a7, A8& a8, A9& a9) const {
|
return result_type(new type(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9));
|
}
|
#endif
|
};
|
|
template<class Pointer, class Allocator, factory_alloc_propagation Policy>
|
class factory
|
: empty_value<typename detail::fc_rebind<Allocator,
|
typename pointer_traits<typename
|
remove_cv<Pointer>::type>::element_type>::type> {
|
public:
|
typedef typename remove_cv<Pointer>::type result_type;
|
|
private:
|
typedef typename pointer_traits<result_type>::element_type type;
|
typedef typename detail::fc_rebind<Allocator, type>::type allocator;
|
typedef empty_value<allocator> base;
|
|
public:
|
factory() BOOST_NOEXCEPT
|
: base(empty_init_t()) { }
|
|
explicit factory(const Allocator& a) BOOST_NOEXCEPT
|
: base(empty_init_t(), a) { }
|
|
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
|
!defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
|
template<class... Args>
|
result_type operator()(Args&&... args) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
detail::fc_construct(s.state(), s.get(), std::forward<Args>(args)...);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
#else
|
result_type operator()() const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type();
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0>
|
result_type operator()(A0& a0) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1>
|
result_type operator()(A0& a0, A1& a1) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1, class A2>
|
result_type operator()(A0& a0, A1& a1, A2& a2) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1, a2);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1, class A2, class A3>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1, a2, a3);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1, a2, a3, a4);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4,
|
A5& a5) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1, a2, a3, a4, a5);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5,
|
class A6>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4, A5& a5,
|
A6& a6) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1, a2, a3, a4, a5, a6);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5,
|
class A6, class A7>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4, A5& a5,
|
A6& a6, A7& a7) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1, a2, a3, a4, a5, a6, a7);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5,
|
class A6, class A7, class A8>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4, A5& a5,
|
A6& a6, A7& a7, A8& a8) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1, a2, a3, a4, a5, a6, a7, a8);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
|
template<class A0, class A1, class A2, class A3, class A4, class A5,
|
class A6, class A7, class A8, class A9>
|
result_type operator()(A0& a0, A1& a1, A2& a2, A3& a3, A4& a4, A5& a5,
|
A6& a6, A7& a7, A8& a8, A9& a9) const {
|
detail::fc_allocate<result_type, allocator> s(base::get());
|
::new((void*)s.get()) type(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9);
|
return s.release(detail::fc_tag<Policy>());
|
}
|
#endif
|
};
|
|
template<class Pointer, class Allocator, factory_alloc_propagation Policy>
|
class factory<Pointer&, Allocator, Policy> { };
|
|
} /* boost */
|
|
#endif
|
