...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
True if spaces encode to and from plus signs.
bool space_as_plus = false;
This option controls whether or not the PLUS character ("+") is used to represent the SP character (" ") when encoding or decoding. Although not prescribed by the RFC, plus signs are commonly treated as spaces upon decoding when used in the query of URLs using well known schemes such as HTTP.