c++stringmemorystlmax

Is the maximum std::string length dictated by stack size or heap size?

std::string myVar;

Is the maximum character myVar can hold is dictated by stack or heap?

Solution

  • By default, the memory allocated for std::string is allocated dynamically.

    Note that std::string has a max_size() function returning the maximum number of character supported by the implementation. The usefulness of this is questionable, though, as it's a implementation maximum, and doesn't take into consideration other resources, like memory. Your real limit is much lower. (Try allocating 4GB of contiguous memory, or take into account memory exhaustion elsewhere.)