GNU的C++代码书写规范，C语言之父Dennis Ritchie亲自修订

C++ Standard Library Style Guidelines  DRAFT 1999-02-26
-------------------------------------

This library is written to appropriate C++ coding standards.  As such,
it is intended to precede the recommendations of the GNU Coding
Standard, which can be referenced here:

http://www.gnu.ai.mit.edu/prep/standards_toc.html

ChangeLog entries for member functions should use the
classname::member function name syntax as follows:

1999-04-15  Dennis Ritchie  <dr@att.com>

* src/basic_file.cc (__basic_file::open): Fix thinko in
_G_HAVE_IO_FILE_OPEN bits.

Notable areas of divergence from what may be previous local practice
(particularly for GNU C) include:

01. Pointers and references
  char* p = "flop";
  char& c = *p;
     -NOT-
  char *p = "flop";  // wrong
  char &c = *p;      // wrong
 
    Reason: In C++, definitions are mixed with executable code.  Here,      
    p          is being initialized, not *p.  This is near-universal
            practice among C++ programmers; it is normal for C hackers
            to switch spontaneously as they gain experience.

02. Operator names and parentheses
  operator==(type)
     -NOT-
  operator == (type)  // wrong
    
    Reason: The == is part of the function name.  Separating
            it makes the declaration look like an expression.

03. Function names and parentheses
  void mangle()
     -NOT-
  void mangle ()  // wrong

     Reason: no space before parentheses (except after a control-flow
     keyword) is near-universal practice for C++.  It identifies the
     parentheses as the function-call operator or declarator, as
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