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

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visit

Invoke a function object with the contents of a value.

template<
    class Visitor>
auto
visit(
    Visitor&& v,
    value& jv);
  » more...

template<
    class Visitor>
auto
visit(
    Visitor&& v,
    value const& jv);
  » more...

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