nlohmann::operator<<

Synopsis

Declared in <nlohmann/json.hpp>

std::ostream&
operator<<(
    std::ostream& o,
    basic_json<> const& j);

This function is a hidden friend of basic_json<>, declared only inside that class: it can be found only through argument-dependent lookup.

the stream o

Name	Description
o	stream to serialize to
j	JSON value to serialize