parameters: (filename, clean_lines, linenum, error)
docstring: Flag those c++11 features that we only allow in certain places.
  
    Args:
      filename: The name of the current file.
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      error: The function to call with any errors found.
docstring_summary: Flag those c++11 features that we only allow in certain places.
docstring_tokens: Flag those c ++ 11 features that we only allow in certain places .
function: def FlagCxx11Features(filename, clean_lines, linenum, error):
    """Flag those c++11 features that we only allow in certain places.
  
    Args:
      filename: The name of the current file.
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      error: The function to call with any errors found.
    """
    line = clean_lines.elided[linenum]
  
    include = Match(r'\s*#\s*include\s+[<"]([^<"]+)[">]', line)
  
    # Flag unapproved C++ TR1 headers.
    if include and include.group(1).startswith('tr1/'):
      error(filename, linenum, 'build/c++tr1', 5,
            ('C++ TR1 headers such as <%s> are unapproved.') % include.group(1))
  
    # Flag unapproved C++11 headers.
    if include and include.group(1) in ('cfenv',
                                        'condition_variable',
                                        'fenv.h',
                                        'future',
                                        'mutex',
                                        'thread',
                                        'chrono',
                                        'ratio',
                                        'regex',
                                        'system_error',
                                       ):
      error(filename, linenum, 'build/c++11', 5,
            ('<%s> is an unapproved C++11 header.') % include.group(1))
  
    # The only place where we need to worry about C++11 keywords and library
    # features in preprocessor directives is in macro definitions.
    if Match(r'\s*#', line) and not Match(r'\s*#\s*define\b', line): return
  
    # These are classes and free functions.  The classes are always
    # mentioned as std::*, but we only catch the free functions if
    # they're not found by ADL.  They're alphabetical by header.
    for top_name in (
        # type_traits
        'alignment_of',
        'aligned_union',
        ):
      if Search(r'\bstd::%s\b' % top_name, line):
        error(filename, linenum, 'build/c++11', 5,
              ('std::%s is an unapproved C++11 class or function.  Send c-style '
               'an example of where it would make your code more readable, and '
               'they may let you use it.') % top_name)
function_tokens: def FlagCxx11Features ( filename , clean_lines , linenum , error ) : line = clean_lines . elided [ linenum ] include = Match ( r'\s*#\s*include\s+[<"]([^<"]+)[">]' , line ) # Flag unapproved C++ TR1 headers. if include and include . group ( 1 ) . startswith ( 'tr1/' ) : error ( filename , linenum , 'build/c++tr1' , 5 , ( 'C++ TR1 headers such as <%s> are unapproved.' ) % include . group ( 1 ) ) # Flag unapproved C++11 headers. if include and include . group ( 1 ) in ( 'cfenv' , 'condition_variable' , 'fenv.h' , 'future' , 'mutex' , 'thread' , 'chrono' , 'ratio' , 'regex' , 'system_error' , ) : error ( filename , linenum , 'build/c++11' , 5 , ( '<%s> is an unapproved C++11 header.' ) % include . group ( 1 ) ) # The only place where we need to worry about C++11 keywords and library # features in preprocessor directives is in macro definitions. if Match ( r'\s*#' , line ) and not Match ( r'\s*#\s*define\b' , line ) : return # These are classes and free functions.  The classes are always # mentioned as std::*, but we only catch the free functions if # they're not found by ADL.  They're alphabetical by header. for top_name in ( # type_traits 'alignment_of' , 'aligned_union' , ) : if Search ( r'\bstd::%s\b' % top_name , line ) : error ( filename , linenum , 'build/c++11' , 5 , ( 'std::%s is an unapproved C++11 class or function.  Send c-style ' 'an example of where it would make your code more readable, and ' 'they may let you use it.' ) % top_name )