Not be scoped



Keywords: not be scoped
Description: The scoped_array class template stores a pointer to a dynamically allocated array. (Dynamically allocated arrays are allocated with the C++ new[] expression.) The array pointed to is guaranteed

The scoped_array class template stores a pointer to a dynamically allocated array. (Dynamically allocated arrays are allocated with the C++ new[] expression.) The array pointed to is guaranteed to be deleted, either on destruction of the scoped_array. or via an explicit reset .

The scoped_array template is a simple solution for simple needs. It supplies a basic "resource acquisition is initialization" facility, without shared-ownership or transfer-of-ownership semantics. Both its name and enforcement of semantics (by being noncopyable ) signal its intent to retain ownership solely within the current scope. Because it is noncopyable. it is safer than shared_array for pointers which should not be copied.

Because scoped_array is so simple, in its usual implementation every operation is as fast as a built-in array pointer and it has no more space overhead that a built-in array pointer.

It cannot be used in C++ standard library containers. See shared_array if scoped_array does not meet your needs.

A std::vector is an alternative to a scoped_array that is a bit heavier duty but far more flexible. A boost::array is an alternative that does not use dynamic allocation.

The class template is parameterized on T. the type of the object pointed to. T must meet the smart pointer common requirements .

Constructs a scoped_array. storing a copy of p. which must have been allocated via a C++ new [] expression or be 0. T is not required be a complete type. See the smart pointer common requirements .

Deletes the array pointed to by the stored pointer. Note that delete[] on a pointer with a value of 0 is harmless. The guarantee that this does not throw exceptions depends on the requirement that the deleted array's objects' destructors do not throw exceptions. See the smart pointer common requirements .

Deletes the array pointed to by the stored pointer and then stores a copy of p, which must have been allocated via a C++ new[] expression or be 0. The guarantee that this does not throw exceptions depends on the requirement that the deleted array's objects' destructors do not throw exceptions. See the smart pointer common requirements .

Returns a reference to element i of the array pointed to by the stored pointer. Behavior is undefined and almost certainly undesirable if the stored pointer is 0, or if i is less than 0 or is greater than or equal to the number of elements in the array.






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