Hierarchy

basic_streambuf<>

Reads and writes the data.

ios_base

Properties of all stream classes independent on the character type.

basic_ios<>

Properties of all stream classes dependent of the character type.

basic_istream<>

Base for the stream classes for the reading of the data.

basic_ostream<>

Base for the stream classes for the writing of the data.

basic_iostream<>

Base for the stream classes for the reading and writing of the data.

The class hierarchy has type synonyms for the character types char and wchar_t. Names not starting with w are type synonyms for char, names starting with w for wchar_t.

The base classes of the class std::basic_iostream<> are virtually derived from std::basic_ios<>, therefore std::basic_iostream<> has only one instance of std::basic_ios.