Further, on many platforms, one should avoid using malloc() unless portability is more important than performance or safety. Some operating systems support useful features like the ability to allocate objects with different expected lifetimes in different heaps, so as to help avoid fragmentation, or arrange to have allocations a program can survive without fail while there is still enough memory to handle critical allocations. Any library that insists upon using "malloc()" will be less than ideal for use with any such operating system.