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50 lines
914 B
Markdown
50 lines
914 B
Markdown
# <small>nlohmann::json_pointer::</small>front
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```cpp
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const string_t& front() const;
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```
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Return the first reference token.
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## Return value
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First reference token.
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## Exception safety
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Strong exception safety: if an exception occurs, the original value stays intact.
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## Exceptions
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Throws [out_of_range.405](../../home/exceptions.md#jsonexceptionout_of_range405) if the JSON pointer has no parent.
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## Complexity
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Constant.
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## Examples
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??? example
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The example shows the usage of `front`.
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```cpp
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--8<-- "examples/json_pointer__front.cpp"
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```
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Output:
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```json
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--8<-- "examples/json_pointer__front.output"
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```
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## See also
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- [back](back.md) return last reference token
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- [pop_front](pop_front.md) remove the first reference token
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- [push_front](push_front.md) append an unescaped token at the start of the pointer
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## Version history
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- Added in version 3.13.0.
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