33 lines
733 B
Markdown
33 lines
733 B
Markdown
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# <small>std::</small>hash<nlohmann::basic_json\>
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```cpp
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namespace std {
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struct hash<nlohmann::basic_json>;
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}
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```
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Return a hash value for a JSON object. The hash function tries to rely on `std::hash` where possible. Furthermore, the
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type of the JSON value is taken into account to have different hash values for `#!json null`, `#!cpp 0`, `#!cpp 0U`, and
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`#!cpp false`, etc.
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## Examples
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??? example
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The example shows how to calculate hash values for different JSON values.
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```cpp
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--8<-- "examples/std_hash.cpp"
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```
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Output:
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```json
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--8<-- "examples/std_hash.output"
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```
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## Version history
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- Added in version 1.0.0.
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- Extended for arbitrary basic_json types in version 3.10.5.
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