http://boost.org/libs/lambda/doc/ar01s04.html#sect:storing_bound_arguments
[1] Strictly taken, the C++ standard defines for_each as a non-modifying sequence operation, and the function object passed to for_each should not modify its argument. The requirements for the arguments of for_each are unnecessary strict, since as long as the iterators are mutable, for_each accepts a function object that can have side-effects on their argument. Nevertheless, it is straightforward to provide another function template with the functionality of std::for_each but more fine-grained requirements for its arguments.
This is incorrect, as well as having a typo. for_each is described as "non-modifying" in the Standard because it does not inherently modify sequences (contrast copy() and friends). However, the functor it takes can mutate its argument. This footnote must be removed. Stephan T. Lavavej http://nuwen.net