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

Constructs an unqualified identifier.

explicit
constexpr
identifier(
    string_view id);
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Constructs an identifier with a single qualifier.

constexpr
identifier(
    string_view qualifier,
    string_view id);
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Constructs an identifier with two qualifiers.

constexpr
identifier(
    string_view qual1,
    string_view qual2,
    string_view id);
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