Difference between revisions of "cpp/memory/new"
m (1 revision: import content) |
Revision as of 14:54, 6 June 2011
Contents |
Allocation
The new expression is a language builtin which is the only way to initialize objects initialize objects in dynamically obtained memory. The memory is acquired by an operator new, new[] (allocation functions).
Deallocation
The delete expression is used to destruct objects previously initialized by the new expression and deallocate memory after that. For deallocation the delete expression uses operator delete, delete[] (deallocation functions).
Note, that it is possible to explicitly call the destructor of an object and deallocation function separately, if required.
Miscellaneous
The <new> header contains declarations of default allocation and deallocation functions (note that these functions are implicitly defined in each translation unit). Also several utility functions, types and objects are declared
bad_alloc |
exception thrown when memory allocation fails |
bad_array_new_length |
exception thrown on allocation of array with greater than implementation supported, or negative length Template:mark c++0x |
nothrow_t |
tag type used to select an non-throwing allocation function |
new_handler |
function pointer type, used in set_new_handler Template:mark c++0x
|
set_new_handler |
sets a function which is called when an allocation function fails to obtain more memory to the free memory pool Template:mark c++0x |
nothrow |
an object of type nothrow_t used to select an non-throwing allocation function
|
