...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Match a character literal.
constexpr implementation-defined
delim_rule(
char ch);
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Match a single character from a character set.
template<
class CharSet>
constexpr implementation-defined
delim_rule(
CharSet const& cs);
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