Comparison To Qsort
sort can be compared to the qsort function in the C standard library (in stdlib.h). sort is templated, so it uses the correct comparison function for whatever data type you are sorting, which is already implemented for standard data types. Otherwise you can specify your own comparison function, which can be type-checked by the compiler; whereas for qsort, you must manually cast pointers to the desired type in an unsafe way. Also, qsort accesses the comparison function using a function pointer, necessitating large numbers of repeated function calls, which can take a lot of time; whereas in C++, comparison functions are usually inlined, removing the need for function calls. In practice, C++ code using sort is often many times faster at sorting simple data like integers than equivalent C code using qsort.
Read more about this topic: Sort (C++)
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