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Implement a utility to help with deleting instances even when exceptions are thrown.

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This commit is contained in:
Sandu Liviu Catalin 2016-10-30 18:25:53 +02:00
parent 4ad9402d8a
commit ad876f6a8f
1 changed files with 79 additions and 2 deletions
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81
shared/Base/Utility.hpp
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@ -1286,6 +1286,83 @@ typedef BitGuard< Uint8 > BitGuardU8;
typedef BitGuard< Uint16 > BitGuardU16;
typedef BitGuard< Uint32 > BitGuardU32;
/* ------------------------------------------------------------------------------------------------
* RAII approach to make sure an instance is deleted regardless of what exceptions are thrown.
*/
template < typename T > struct DeleteGuard
{
private:
// --------------------------------------------------------------------------------------------
T * m_Ptr; // Pointer to the instance to manage.
public:
/* --------------------------------------------------------------------------------------------
* Default constructor.
*/
DeleteGuard(T * ptr)
: m_Ptr(ptr)
{
/* ... */
}
/* --------------------------------------------------------------------------------------------
* Copy constructor. (disabled)
*/
DeleteGuard(const DeleteGuard & o) = delete;
/* --------------------------------------------------------------------------------------------
* Move constructor. (disabled)
*/
DeleteGuard(DeleteGuard && o) = delete;
/* --------------------------------------------------------------------------------------------
* Destructor.
*/
~DeleteGuard()
{
if (m_Ptr)
{
delete m_Ptr;
}
}
/* --------------------------------------------------------------------------------------------
* Copy assignment operator. (disabled)
*/
DeleteGuard & operator = (const DeleteGuard & o) = delete;
/* --------------------------------------------------------------------------------------------
* Move assignment operator. (disabled)
*/
DeleteGuard & operator = (DeleteGuard && o) = delete;
/* --------------------------------------------------------------------------------------------
* Implicit conversion the managed instance type.
*/
operator T * () const
{
return m_Ptr;
}
/* --------------------------------------------------------------------------------------------
* Retrieve the managed instance.
*/
T * Get() const
{
return m_Ptr;
}
/* --------------------------------------------------------------------------------------------
* Release the managed instance.
*/
void Release()
{
m_Ptr = nullptr;
}
};
/* ------------------------------------------------------------------------------------------------
* RAII approach to make sure a value is assigned regardless of what exceptions are thrown.
*/
@ -1300,7 +1377,7 @@ private:
public:
/* --------------------------------------------------------------------------------------------
* Default constructor.
* Base constructor.
*/
AutoAssign(T & variable, T value)
: m_Var(variable), m_Val(value)
@ -1309,7 +1386,7 @@ public:
}
/* --------------------------------------------------------------------------------------------
* Default constructor.
* Base constructor.
*/
AutoAssign(T & variable, T value, T start)
: m_Var(variable), m_Val(value)