Hands-On Design Patterns with C++

The main idea

To understand local buffer optimization, you have to remember that memory allocations do not happen in isolation. Usually, if a small amount of memory is needed, the allocated memory is used as a part of some data structure. For example, let's consider a very simple character string:

class simple_string {    public:    simple_string() : s_() {}    explicit simple_string(const char* s) : s_(strdup(s)) {}    simple_string(const simple_string& s) : s_(strdup(s.s_)) {}    simple_string& operator=(const char* s) {        free(s_); s_ = strdup(s); return *this;    }    simple_string& operator=(const simple_string& s)     {       free(s_); s_ = strdup(s.s_); return *this;    }    bool operator==(const simple_string& rhs)     const {            return strcmp(s_, rhs.s_) == 0;           } ~simple_string() ...