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51 lines
971 B
Markdown
51 lines
971 B
Markdown
---
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title: "threshold"
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---
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{{< callout type="info">}}
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Header: `threshold.h`
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From: `20.9.0`
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{{< /callout >}}
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```cpp
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template <typename TInput, typename TCompare = etl::less<TInput> >
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class threshold : public etl::unary_function<TInput, TInput>
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```
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`TInput` The input data type.
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`TCompare` The functor type used to compare values to the threshold. The default is `etl::less`.
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---
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```cpp
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threshold(TInput threshold_value,
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TInput true_value,
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TInput false_value,
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TCompare compare = TCompare())
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```
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**Description**
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Constructor.
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---
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```cpp
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TInput operator()(TInput value) const
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```
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Threshold a value.
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## Example
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```cpp
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std::array<int, 10> input
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{
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9
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};
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std::array<int, 10> output;
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etl::threshold<int> threshold(4, 0, 9); // Compares each value to 4 and output 0 or 9.
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std::transform(input.begin(), input.end(), output.begin(), threshold);
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// output == 0, 0, 0, 0, 9, 9, 9, 9, 9, 9
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```
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