Before C++11, if you wanted to pass a function with closure-like behavior to an STL algorithm, you had to write a little class with operator() overloaded. It wa

Before C++11, if you wanted to pass a function with closure-like behavior to an STL algorithm, you had to write a little class with operator() overloaded. It was a huge pain in the ass, lots of boilerplate code. Most programmers didn't bother and wrote plain loops. Now with C++11 lambdas, std::algorithm is much nicer to use.