grammar::lut_chars::operator+

Return the union of two character sets.

Synopsis

Defined in header <boost/url/grammar/lut_chars.hpp>

friend constexpr lut_chars
operator+(
    lut_chars const& cs0,
    lut_chars const& cs1);

Description

This function returns a new character set which contains all of the characters in cs0 as well as all of the characters in cs.

Example

This creates a character set which includes all letters and numbers

constexpr lut_chars alpha_chars(
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "abcdefghijklmnopqrstuvwxyz");

constexpr lut_chars alnum_chars = alpha_chars + "0123456789";

Complexity

Constant.

Return Value

The new character set.

Parameters

Name	Description
`cs0`	A character to join
`cs1`	A character to join

Convenience header <boost/url/grammar.hpp>