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Allow shared pointers to have custom deleters.

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This commit is contained in:
Sandu Liviu Catalin 2020-04-17 15:24:38 +03:00
parent f0b00fb07f
commit 603d358e5f
1 changed files with 122 additions and 6 deletions
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128
sqrat/sqrat/sqratUtil.h
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@ -193,8 +193,14 @@ static std::string wstring_to_string(const std::wstring& wstr)
}
#endif // SQUNICODE
template < class T >
struct SqDefaultAllocator;
template < class T >
struct SqDefaultDelete;
template < class T >
struct SqDefaultDestructor;
template <class T>
template <class T, class D=SqDefaultDelete<T>>
class SharedPtr;
template <class T>
@ -516,6 +522,116 @@ inline string LastErrorString(HSQUIRRELVM vm) {
return string(sqErr, size);
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Primary template of `SqDefaultAllocator`.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < class T > struct SqDefaultAllocator {
// ----------------------------------------------------------------------------------------------------------------
// Type of value used to store a single element of the given type with the proper alignment.
using StorageType = typename std::aligned_storage< sizeof(T), alignof(T) >::type;
// ----------------------------------------------------------------------------------------------------------------
// Allocate memory (possibly uninitialized) for the specialized type.
template < class... A > static T * New(A&&... a) { return new T(std::forward< A >(a)...); }
// Allocate memory (preferably uninitialized) for the specialized type.
static T * NewRaw() { return reinterpret_cast< T * >(new StorageType); }
// ----------------------------------------------------------------------------------------------------------------
// Allocate memory (possibly uninitialized) for the specialized type.
template < class... A > static T * NewN(size_t n, A&&... a) {
T * p = NewRawN(n);
assert(p);
for (size_t i = 0; i < n; ++i) {
new (&p[i]) T(std::forward< A >(a)...); // Invoke constructor
}
return p;
}
// Allocate memory (preferably uninitialized) for the specialized type.
static T * NewRawN(size_t n) { return reinterpret_cast< T * >(new StorageType[n]); }
// ----------------------------------------------------------------------------------------------------------------
// Deallocate memory (possibly uninitialized) for the specialized type.
static void Delete(T * p) { delete p; }
// Deallocate memory (preferably uninitialized) for the specialized type.
static void DeleteRaw(T * p) { delete reinterpret_cast< StorageType * >(p); }
// ----------------------------------------------------------------------------------------------------------------
// Deallocate memory (possibly uninitialized) for the specialized type.
static void Delete(T * p, size_t SQ_UNUSED_ARG(n)) { delete[] p; }
// Deallocate memory (preferably uninitialized) for the specialized type.
static void DeleteRaw(T * p, size_t SQ_UNUSED_ARG(n)) { delete[] reinterpret_cast< StorageType * >(p); }
};
// ====================================================================================================================
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Primary template of `SqDefaultDelete`. Will invoke the instance destructor and free the associated memory.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < class T > struct SqDefaultDelete {
// The type given via template parameter.
using ValueType = T;
// Default constructor.
constexpr SqDefaultDelete() noexcept = default;
// Function call operator that forwards the call to delete on the given pointer.
void operator () (T * p) const {
static_assert(!std::is_void< T >::value, "Cannot delete pointer to incomplete type.");
static_assert(sizeof(T), "Cannot delete pointer to incomplete type.");
delete p;
}
};
// --------------------------------------------------------------------------------------------------------------------
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Specialization of `SqDefaultDelete` for arrays. Will invoke each instance destructor and free the associated memory.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < class T > struct SqDefaultDelete< T[] > {
// The type given via template parameter.
using ValueType = T;
// Default constructor.
constexpr SqDefaultDelete() noexcept = default;
// Function call operator that forwards the call to delete on the given pointer.
void operator () (T * p, size_t SQ_UNUSED_ARG(n)) const {
static_assert(sizeof(T), "Cannot delete pointer to incomplete type.");
delete[] p;
}
};
// --------------------------------------------------------------------------------------------------------------------
// Omit specialization for array objects with a compile time length.
template < class T, unsigned N > struct SqDefaultDelete< T[N] >;
// ====================================================================================================================
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Primary template of `SqDefaultDestructor`. Will only invoke the instance destructor and not free the associated memory.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < class T > struct SqDefaultDestructor {
// The type given via template parameter.
using ValueType = T;
// Default constructor.
constexpr SqDefaultDestructor() noexcept = default;
// Function call operator that forwards the call ro `~T()` on the given pointer.
void operator () (T * p) const {
static_assert(!std::is_void< T >::value, "Cannot destroy pointer to incomplete type.");
static_assert(sizeof(T), "Cannot destroy pointer to incomplete type.");
assert(p == nullptr);
p->~T();
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Specialization of `SqDefaultDestructor` for arrays. Will only invoke each instance destructor and not free the associated memory.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < class T > struct SqDefaultDestructor< T[] > {
// The type given via template parameter.
using ValueType = T;
// Default constructor.
constexpr SqDefaultDestructor() noexcept = default;
// Function call operator that forwards the call to `~T()` on the given pointer.
void operator () (T * p, size_t SQ_UNUSED_ARG(n)) const {
static_assert(sizeof(T), "Cannot destroy pointer to incomplete type.");
assert(p == nullptr && n > 0);
for (size_t i = 0; i < n; ++i) p[i].~T(); // Invoke destructor
}
};
// --------------------------------------------------------------------------------------------------------------------
// Omit specialization for array objects with a compile time length.
template < class T, unsigned N > struct SqDefaultDestructor< T[N] >;
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Used internally to store the counters of managed pointers.
///
@ -555,10 +671,10 @@ struct SqReferenceCounter {
/// std::shared_ptr was not used because it is a C++11 feature.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template <class T>
template <class T, class D>
class SharedPtr
{
template <class U>
template <class U, class V>
friend class SharedPtr;
template <class U>
@ -880,7 +996,7 @@ public:
if (m_Ref->mHard == 0)
{
delete m_Ptr;
D{}(m_Ptr);
}
--(m_Ref->mSoft);
@ -899,7 +1015,7 @@ public:
/// Checks if there is an associated managed object
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
operator bool () const
operator bool () const // NOLINT(google-explicit-constructor,hicpp-explicit-conversions)
{
return m_Ptr;
}
@ -1085,7 +1201,7 @@ public:
template <class T>
class WeakPtr
{
template <class U>
template <class U, class D>
friend class SharedPtr;
typedef SqReferenceCounter Counter;