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std::get_deleter cppreference com
If the behavior of a deallocation function does not satisfy the default constraints, the behavior is undefined. In any case, the matching deallocation function (if any) must be non-deleted and(since C++11) accessible from the point where the new expression appears. If a deallocation function terminates by throwing an exception, the behavior is undefined, even if it is declared with noexcept(false)(since C++11). If ptr is a pointer to a base class subobject of the object that was allocated with new, the destructor of the base class must be virtual, otherwise the behavior is undefined.
Static overloaded operators
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
