Left shift operators
<nlohmann/json.hpp>deserialize from stream
[[__deprecated__]]
std::istream&
operator<<(
    basic_json& j,
    std::istream& i);
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serialize to stream
std::ostream&
operator<<(
    std::ostream& o,
    basic_json const& j);
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write string representation of the JSON pointer to stream
std::ostream&
operator<<(
    std::ostream& o,
    json_pointer const& ptr);
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deserialize from stream
[[__deprecated__]]
std::istream&
operator<<(
    basic_json& j,
    std::istream& i);
» more...
serialize to stream
std::ostream&
operator<<(
    std::ostream& o,
    basic_json const& j);
» more...