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nlohmann
48 lines
1.1 KiB
Markdown
48 lines
1.1 KiB
Markdown
# <small>nlohmann::basic_json::</small>is_number_integer
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```cpp
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constexpr bool is_number_integer() const noexcept;
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```
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This function returns `#!cpp true` if and only if the JSON value is a signed or unsigned integer number. This excludes
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floating-point values.
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## Return value
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`#!cpp true` if type is an integer or unsigned integer number, `#!cpp false` otherwise.
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## Exception safety
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No-throw guarantee: this member function never throws exceptions.
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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 following code exemplifies `is_number_integer()` for all JSON types.
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```cpp
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--8<-- "examples/is_number_integer.cpp"
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```
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Output:
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```json
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--8<-- "examples/is_number_integer.output"
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```
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## See also
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- [is_number()](is_number.md) check if the value is a number
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- [is_number_unsigned()](is_number_unsigned.md) check if the value is an unsigned integer number
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- [is_number_float()](is_number_float.md) check if the value is a floating-point number
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## Version history
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- Added in version 1.0.0.
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- Extended to also return `#!cpp true` for unsigned integers in 2.0.0.
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