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63 lines
1.2 KiB
Markdown
63 lines
1.2 KiB
Markdown
---
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title: "Invert"
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---
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{{< callout type="info">}}
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Header: `invert.h`
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Since: `20.9.0`
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{{< /callout >}}
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Invert an input range.
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```cpp
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template <typename TInput>
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class invert : public etl::unary_function<TInput, TInput>
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```
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``TInput``` The input data type.
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```cpp
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invert()
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```
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**Description**
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`offset` = 0
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`minuend` = `etl::numeric_limits<TInput>::is_signed) ? TInput(0)
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: etl::numeric_limits<TInput>::max())`
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If the type is signed then the input values have their sign changed.
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i.e. `10` => `-10`, `-10` => `10`.
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If the type is unsigned then the input values are subtracted from the type's maximum value.
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---
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```cpp
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invert(TInput offset, TInput minuend)
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```
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**Description**
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Sets the offset and minuend.
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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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**Description**
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Invert a value.
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Calculates `minuend - (value - offset)`
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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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10, 11, 12, 13, 14, 15, 16, 17, 18, 19
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};
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std::array<int, 10> output;
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etl::invert<int> invert(10, 100); // offset = 10, minuend = 100
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std::transform(input.begin(), input.end(), output.begin(), invert);
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// output = 100.0, 99.0, 98.0, 97.0, 96.0, 95.0, 94.0, 93.0, 92.0, 91.0
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```
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