NullAllocator< T > Class Template Reference
NULL allocator. More...
Public Types | |
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typedef AllocatorBase< T > ::value_type | value_type |
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typedef AllocatorBase< T > ::size_type | size_type |
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typedef AllocatorBase< T > ::difference_type | difference_type |
| typedef AllocatorBase< T >::pointer | pointer |
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typedef AllocatorBase< T > ::const_pointer | const_pointer |
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typedef AllocatorBase< T > ::reference | reference |
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typedef AllocatorBase< T > ::const_reference | const_reference |
Public Member Functions | |
| pointer | allocate (size_type n, const void *unused=NULL) |
| void | deallocate (void *p, size_type n) |
| size_type | max_size () const |
| Returns the maximum number of elements the allocator can provide. | |
| pointer | address (reference r) const |
| const_pointer | address (const_reference r) const |
| void | construct (pointer p, const T &val) |
| template<typename U , typename... Args> | |
| void | construct (U *ptr, Args &&...args) |
| Constructs a new U using variadic arguments. | |
| void | destroy (pointer p) |
| template<typename U > | |
| void | destroy (U *ptr) |
| Destroys an U constructed with variadic arguments. | |
Detailed Description
template<class T>
class NullAllocator< T >
NULL allocator.
- Template Parameters:
-
T class or type
A NullAllocator is useful for fixed-size, stack based allocations (i.e., static arrays used by FixedSizeAllocatorWithCleanup).
A NullAllocator always returns 0 for max_size(), and always returns NULL for allocation requests. Though the allocator does not allocate at runtime, it does perform a secure wipe or zeroization during cleanup.
Definition at line 253 of file secblock.h.
Member Function Documentation
| size_type NullAllocator< T >::max_size | ( | ) | const [inline] |
Returns the maximum number of elements the allocator can provide.
- Returns:
- the maximum number of elements the allocator can provide
Internally, preprocessor macros are used rather than std::numeric_limits because the latter is not a constexpr. Some compilers, like Clang, do not optimize it well under all circumstances. Compilers like GCC, ICC and MSVC appear to optimize it well in either form.
Reimplemented from AllocatorBase< T >.
Definition at line 273 of file secblock.h.
| void AllocatorBase< T >::construct | ( | U * | ptr, | |
| Args &&... | args | |||
| ) | [inline, inherited] |
Constructs a new U using variadic arguments.
- Template Parameters:
-
U the type to be forwarded Args the arguments to be forwarded
- Parameters:
-
ptr pointer to type U args variadic arguments
This is a C++11 feature. It is available when CRYPTOPP_CXX11_VARIADIC_TEMPLATES is defined. The define is controlled by compiler versions detected in config.h.
Definition at line 67 of file secblock.h.
| void AllocatorBase< T >::destroy | ( | U * | ptr | ) | [inline, inherited] |
Destroys an U constructed with variadic arguments.
- Template Parameters:
-
U the type to be forwarded
This is a C++11 feature. It is available when CRYPTOPP_CXX11_VARIADIC_TEMPLATES is defined. The define is controlled by compiler versions detected in config.h.
Definition at line 74 of file secblock.h.
The documentation for this class was generated from the following file:
