Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the master branch, built from commit 41715b1c50.
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grammar::lut_chars::operator-

Return a new character set by subtracting.

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 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.

Convenience header <boost/url/grammar.hpp>


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