Function CheckForIncludeWhatYouUse

scripts/cpp_lint.py:4487–4577

Reports for missing stl includes. This function will output warnings to make sure you are including the headers necessary for the stl containers and functions that you use. We only give one reason to include a header. For example, if you use both equal_to<> and less<> in a .h file, only one

(filename, clean_lines, include_state, error,
                              io=codecs)

def CheckForIncludeWhatYouUse(filename, clean_lines, include_state, error,
                              io=codecs):
  """Reports for missing stl includes.

  This function will output warnings to make sure you are including the headers
  necessary for the stl containers and functions that you use. We only give one
  reason to include a header. For example, if you use both equal_to<> and
  less<> in a .h file, only one (the latter in the file) of these will be
  reported as a reason to include the <functional>.

  Args:
    filename: The name of the current file.
    clean_lines: A CleansedLines instance containing the file.
    include_state: An _IncludeState instance.
    error: The function to call with any errors found.
    io: The IO factory to use to read the header file. Provided for unittest
        injection.
  """
  required = {}  # A map of header name to linenumber and the template entity.
                 # Example of required: { '<functional>': (1219, 'less<>') }

  for linenum in xrange(clean_lines.NumLines()):
    line = clean_lines.elided[linenum]
    if not line or line[0] == '#':
      continue

    # String is special -- it is a non-templatized type in STL.
    matched = _RE_PATTERN_STRING.search(line)
    if matched:
      # Don't warn about strings in non-STL namespaces:
      # (We check only the first match per line; good enough.)
      prefix = line[:matched.start()]
      if prefix.endswith('std::') or not prefix.endswith('::'):
        required['<string>'] = (linenum, 'string')

    for pattern, template, header in _re_pattern_algorithm_header:
      if pattern.search(line):
        required[header] = (linenum, template)

    # The following function is just a speed up, no semantics are changed.
    if not '<' in line:  # Reduces the cpu time usage by skipping lines.
      continue

    for pattern, template, header in _re_pattern_templates:
      if pattern.search(line):
        required[header] = (linenum, template)

  # The policy is that if you #include something in foo.h you don't need to
  # include it again in foo.cc. Here, we will look at possible includes.
  # Let's copy the include_state so it is only messed up within this function.
  include_state = include_state.copy()

  # Did we find the header for this file (if any) and successfully load it?
  header_found = False

  # Use the absolute path so that matching works properly.
  abs_filename = FileInfo(filename).FullName()