Documented functions from math.h

docs/maths/math.md

@@ -0,0 +1,102 @@
+---
+title: "math"
+---
+
+{{< callout type="info">}}
+  Header: `math.h`  
+  From: `20.50.0`  
+{{< /callout >}}
+
+Various mathematical utilities
+
+## is_nan
+
+```cpp
+template <typename T>
+ETL_CONSTEXPR bool is_nan(T value)
+```
+**Returns**  
+`true` if `value` is `NAN` (Not A Number).  
+Always returns `false` if `T` is an integral.
+
+## is_infinity
+
+```cpp
+template <typename T>
+ETL_CONSTEXPR bool is_infinity(T value)
+```
+**Returns**  
+`true` if `value` is infinity.  
+Always returns `false` if `T` is an integral.
+
+## is_zero
+
+```cpp
+template <typename T>
+ETL_CONSTEXPR bool is_zero(T value)
+```
+**Returns**  
+`true` if `value` is Zero.  
+
+## is_exactly_zero
+
+```cpp
+template <typename T>
+ETL_CONSTEXPR bool is_exactly_equal(T value1, T value2)
+```
+**Returns**  
+`true` if `value1` is equal to `value2`.  
+
+## floor
+
+```cpp
+ETL_NODISCARD
+float floor(float value) ETL_NOEXCEPT
+```
+**Returns**  
+`::floorf(value)`
+
+---
+
+```cpp
+ETL_NODISCARD
+double floor(double value) ETL_NOEXCEPT
+```
+**Returns**  
+`::floor(value)`
+
+---
+
+```cpp
+ETL_NODISCARD
+long double floor(long double value) ETL_NOEXCEPT
+```
+**Returns**  
+`::floorl(value)`
+
+## ceil
+
+```cpp
+ETL_NODISCARD
+float ceil(float value) ETL_NOEXCEPT
+```
+**Returns**  
+`::ceilf(value)`
+
+---
+
+```cpp
+ETL_NODISCARD
+double ceil(double value) ETL_NOEXCEPT
+```
+**Returns**  
+`::ceil(value)`
+
+---
+
+```cpp
+ETL_NODISCARD
+long double ceil(long double value) ETL_NOEXCEPT
+```
+**Returns**  
+`::ceill(value)`