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The C programming language manages memory statically, automatically, or dynamically.Static-duration variables are allocated in main memory, usually along with the executable code of the program, and persist for the lifetime of the program; automatic-duration variables are allocated on the stack and come and go as functions are called and return.
However, for containers that require frequent allocations of small objects, such as map and list, using the default allocator is generally slow. [4] [17] Other common problems with a malloc-based allocator include poor locality of reference, [4] and excessive memory fragmentation. [4] [17]
In computer science, manual memory management refers to the usage of manual instructions by the programmer to identify and deallocate unused objects, or garbage.Up until the mid-1990s, the majority of programming languages used in industry supported manual memory management, though garbage collection has existed since 1959, when it was introduced with Lisp.
Dmalloc is a C memory debugger library written by Gray Watson to assist programmers in finding a variety of dynamic memory allocation mistakes. It replaces parts (such as malloc) of the C standard library provided by the operating system or compiler with its own versions, which produce information intended to help the programmer detect problematic code.
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C++ also supports malloc and free, from C, but these are not compatible with new and delete. Use of new returns an address to the allocated memory. The C++ Core Guidelines advise against using new directly for creating dynamic objects in favor of smart pointers through make_unique < T > for single ownership and make_shared < T > for reference ...