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Support for make_shared

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This commit is contained in:
Baptiste Wicht 2016-09-30 15:41:29 +02:00
parent c770c5874f
commit 2dc50176b7
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GPG Key ID: C5566B6C7F884532
1 changed files with 27 additions and 2 deletions
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29
tstl/include/shared_ptr.hpp
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@ -19,12 +19,14 @@ namespace std {
*
* TODO
*/
template <typename T, typename D = default_delete<T>>
template <typename T>
struct shared_ptr {
using pointer_type = T*; ///< The pointer type
using reference_type = T&; ///< The reference type
using element_type = T; ///< The element type
struct control_block_t;
constexpr shared_ptr() : ptr(), control_block() {}
constexpr explicit shared_ptr(decltype(nullptr)) : ptr(), control_block() {}
@ -41,6 +43,10 @@ struct shared_ptr {
control_block->counter = 1;
}
shared_ptr(T* ptr, control_block_t* control_block, int) : ptr(ptr), control_block(control_block) {
control_block->counter = 1;
}
shared_ptr(const shared_ptr& rhs) : ptr(rhs.ptr), control_block(rhs.control_block) {
__sync_fetch_and_add(&control_block->counter, 1);
}
@ -99,7 +105,6 @@ struct shared_ptr {
return get();
}
private:
struct control_block_t {
volatile size_t counter;
@ -122,10 +127,30 @@ private:
}
};
template <typename U>
struct inplace_control_block_impl : control_block_t {
U ptr;
template<typename... Args>
inplace_control_block_impl(Args&&... args) : ptr(std::forward<Args>(args)...){}
virtual void destroy(){
// Nothing to do
}
};
private:
pointer_type ptr;
control_block_t* control_block;
};
template <typename T, typename... Args>
std::shared_ptr<T> make_shared(Args&&... args){
auto cb = new typename std::shared_ptr<T>::template inplace_control_block_impl<T>(std::forward<Args>(args)...);
return std::shared_ptr<T>{&cb->ptr, cb, 0};
}
} //end of namespace std
#endif