[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] UCHAR_MAX macro (<climits> header)  uflow function     (basic_filebuf class template)      (basic_streambuf class template)  UINT_MAX macro (<climits> header)  ULONG_MAX macro (<climits> header)  unary expressions  unary_function class template (<functional> header)  unary_negate class template (<functional> header)  uncaught_exception function (<exception> header)  undefined behavior (glossary definition)  underflow function     (basic_filebuf class template)      (basic_streambuf class template)      (basic_stringbuf class template)      (strstreambuf class)  underflow_error class (<stdexcept> header)  underscores     identifiers starting with      identifiers with two consecutive  unexpected constructor calls  unexpected function      (<exception> header)  unformatted I/O  unget function (basic_istream class template)  ungetc function (<cstdio> header)  ungetwc function (<cwchar> header)  Unicode characters in source file  uninitialized_copy function template (<memory> header)  uninitialized_fill function template (<memory> header)  uninitialized_fill_n function template (<memory> header)  union keyword      C versus C++  unions      anonymous  [See anonymous unions]     C versus C++      versus inheritance  unique function (list class template)  unique function template (<algorithm> header)  2nd  unique_copy function template (<algorithm> header)  2nd  unitbuf function      (<ios> header)  unitbuf literal  universal characters      compilers and  unnamed namespace  unqualified function calls  2nd  unqualified name  unqualified name lookup  unsetf function (ios_base class)  unshift function (codecvt class template)  unsigned char type  unsigned long int type  unsigned short int type  upper_bound function      (map class template)      (multimap class template)      (multiset class template)      (set class template)  upper_bound function template (<algorithm> header)  2nd  uppercase function      (<ios> header)  uppercase literal  use_facet function template (<locale> header)  user-defined conversion sequence  USHRT_MAX macro (<climits> header)  using declarations  2nd  using directives  2nd      within classes or namespaces  UTF-32 encoding  _ _uuidof operator (RAD extension)