Parsing Operators – Standard Library

The get operator function was changed to use a standard input stream (again using a temporary input string stream like the two previous functions).  This function uses one of the table search functions, which was modified to take a standard string.

The table search function used the compare function from the QString class with the case insensitive option.  There is no equivalent function in the standard string class.  The std::equal function is used instead by passing a no case comparison lambda function.  This is the same lambda function used in the Tester class, so this definition was moved to the main header file.  Since the name in the table is still a QString, it is temporarily converted to a standard string.  The std::equal function assumes the arguments are the same size, so the size of the strings are checked first.

The token constructor for codes was changed to take a standard string, which defaults to an empty string.  For now, these are converted for the QString member variable by obtaining a c-style string from the standard string, which is implicitly converted.  The only caller of this constructor using this argument is the new token table function, which was also modified to take a standard string.  Callers of this function using the string argument were modified to pass a standard string.

[branch parser commit 27f06e8714]