# Extra Clang Tools 4 documentation

## clang-tidy - cppcoreguidelines-no-malloc

# cppcoreguidelines-no-malloc

This check handles C-Style memory management using `malloc()`, `realloc()`, `calloc()` and `free()`. It warns about its use and tries to suggest the use of an appropriate RAII object. See C++ Core Guidelines <https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Rr-mallocfree>.

There is no attempt made to provide fixit hints, since manual resource management isn’t easily transformed automatically into RAII.

    // Warns each of the following lines.
    // Containers like std::vector or std::string should be used.
    char* some_string = (char*) malloc(sizeof(char) * 20);
    char* some_string = (char*) realloc(sizeof(char) * 30);
    free(some_string);

    int* int_array = (int*) calloc(30, sizeof(int));

    // Rather use a smartpointer or stack variable.
    struct some_struct* s = (struct some_struct*) malloc(sizeof(struct some_struct));