Is char a Signed Type

std::numeric_limits<char>::is_signed tells you if char is a signed type or not.

Reference: The C++ Standard Library by Nicolai M. Josuttis. Addison-Wesley, 1999, p. 61-62.

NULL

A C NULL is (void*)0, a C++ NULL is 0.

Reference: The C++ Standard Library: A Tutorial and Reference by Nicolai M. Josuttis. Addison-Wesley, 1999, p. 71.

atexit() Function

Functions registered by atexit() are executed in reverse order when a program ends.

If exit() is called, these functions are still called.

If abort() is called, these functions are not called.

Reference: The C++ Standard Library by Nicolai M. Josuttis. Addison-Wesley, 1999, p. 71.

Tertiary Operator

Given:

    int x = 0; 
    int y = 0; 

Then:

    (1 ? x : y) = 4; 

Sets x to 4.

String's push_back() Member Function

The string container has a push_back() member function.

Reference: The C++ Standard Library by Nicolai Josuttis. Addison-Wesley, 1999, p. 81.

Incrementing an Insert Iterator

Incrementing an insert iterator is a NO OP.

Reference: The C++ Standard Library by Nicolai M. Josuttiis. Addison-Wesley, 1999, p. 104.

Vector at() Function

If you have a vector v; v.at(10) will do range checking, while v[10] will not.

Reference: The C++ Standard Library by Nicolai M. Josuttis. Addison-Wesley, 1999, p. 152.