If the shared pointer p owns a deleter of type cv-unqualified Deleter (e.g. if it was created with one of the constructors that take a deleter as a parameter), then returns a pointer to the deleter. Performs contextual conversion to bool, user-defined classes that are intended to be used in boolean contexts could provide only operator bool and need not overload operator!. Creates and initializes objects with dynamic storage duration, that is, objects whose lifetime is not necessarily limited by the scope in which they were created.
- If the file is currently open by any process, the behavior of this function is implementation-defined.
- If the value type is known to be a scalar type, the const variant should return by value.
- At the point in the code the operator() is called, the type must be complete.
- The delete expression looks for appropriate deallocation function’s name starting from the class scope (array form looks in the scope of the array element class) and proceeds to the global scope if no members are found as usual.
- Only new expressions that would otherwise result in a call to a replaceable global allocation function can be evaluated in constant expressions.
The behaviors of non-punctuation operators are described in their own respective pages. Unless otherwise specified, the remaining description in this page does not apply to these functions. Customizes the C++ operators for operands of user-defined types. If the file is currently open by any process, the behavior of this function is implementation-defined. POSIX systems unlink the file name (directory entry), but the filesystem space used by the file is not reclaimed while it is open in any process and while other hard links to the file exist.
For a non-placement allocation function, the normal deallocation function lookup is used to find the matching deallocation function (see delete-expression). The new expression attempts to allocate storage and then attempts to construct and initialize either a single unnamed object, or an unnamed array of objects in the allocated storage. The new expression returns a prvalue pointer to the constructed object or, if an array of objects was constructed, a pointer to the initial element of the array.
Member functions
For loading a large file, file mapping via OS-specific functions, e.g., mmap on POSIX or CreateFileMapping(A/W) along with MapViewOfFile on Windows, is preferable to allocating a buffer for file reading. Because a pair of brackets following the keyword delete is always interpreted as the array form of a delete-expression, a lambda-expression with an empty capture list immediately after delete must be enclosed in parentheses. Given the pointer evaluated from expression (after possible conversions) as ptr. If the value type is known to be a scalar type, the const variant should return by value. POSIX specifies many additional details for the behavior of this function. Removes all elements satisfying specific criteria from the range
