Return a new character set by subtracting
Synopsis
Declared in header <boost/url/grammar/lut_chars.hpp>
Description
This function returns a new character
set which is formed from all of the
characters in cs0
which are not in cs
.
Example
This statement declares a character set containing all the lowercase letters which are not vowels:
constexpr lut_chars consonants = lut_chars("abcdefghijklmnopqrstuvwxyz") - "aeiou";
Complexity
Constant.
Return Value
The new character set.
Parameters
Name | Description |
---|---|
cs0 |
A character set to join. |
cs1 |
A character set to join. |