mirror of
https://github.com/ETLCPP/etl.git
synced 2026-11-09 22:59:47 +08:00
08b9c371a0
* Fix histogram test Use different Start index so skipped start_index copy would not get unnoticed in the test. * Fix several test_vector_* for valid data Instead of comparing the moved-from data which is invalid, compare with the valid initial_data. * Fix test_vector to check for the correct iterator position after erase This was done before, but a recent change dropped it. * Fix bit_stream: Guard nbits > 0 to prevent division by zero * Cleanup --------- Co-authored-by: John Wellbelove <jwellbelove@users.noreply.github.com>
83 lines
2.1 KiB
Markdown
83 lines
2.1 KiB
Markdown
---
|
|
title: "endian"
|
|
---
|
|
|
|
{{< callout type="info">}}
|
|
Header: `endianness.h`
|
|
Since: `TBC`
|
|
{{< /callout >}}
|
|
|
|
Constants & utilities for endianness.
|
|
|
|
For endian specific integral types, see `unaligned_type`.
|
|
|
|
The values for endianness are dependent on the platform setup.
|
|
|
|
If `ETL_ENDIAN_NATIVE` is defined by the user, then
|
|
 `etl::endian::little = 0`
|
|
 `etl::endian::big = 1`
|
|
|
|
If `ETL_ENDIAN_NATIVE` is not defined by the user, then the ETL selects an appropriate definition.
|
|
 If `ETL_CPP20_SUPPORTED == 1` and `ETL_USING_STL == 1` then
|
|
  `etl::endian::little = std::endian::little`
|
|
  `etl::endian::big = std::endian::big`
|
|
  `etl::endian::native = std::endian::native`
|
|
|
|
else if `__BYTE_ORDER__` is defined then
|
|
 If `__ORDER_LITTLE_ENDIAN__` is defined then
|
|
  `etl::endian::little = __ORDER_LITTLE_ENDIAN__`
|
|
  `etl::endian::big = __ORDER_BIG_ENDIAN__`
|
|
  `etl::endian::native = __BYTE_ORDER__`
|
|
|
|
 else if `__LITTLE_ENDIAN__` is defined
|
|
  `etl::endian::little = __LITTLE_ENDIAN__`
|
|
  `etl::endian::big = __BIG_ENDIAN__`
|
|
  `etl::endian::native = __BYTE_ORDER__`
|
|
|
|
else
|
|
The user needs to define `ETL_ENDIAN_NATIVE` either as `0` for little endian or `1` for big endian.
|
|
|
|
## endian
|
|
A smart enumeration defining little and big members.
|
|
```cpp
|
|
etl::endian::little;
|
|
etl::endian::big;
|
|
```
|
|
|
|
## endianness
|
|
Interrogates the endianness of the platform.
|
|
```cpp
|
|
etl::endian operator ()() const
|
|
```
|
|
`constexpr` if `ETL_CPP11_SUPPORTED == 1` and `ETL_ENDIAN_NATIVE` is defined.
|
|
|
|
---
|
|
|
|
```cpp
|
|
operator etl::endian() const
|
|
```
|
|
`constexpr` if `ETL_CPP11_SUPPORTED == 1` and `ETL_ENDIAN_NATIVE` is defined.
|
|
|
|
---
|
|
|
|
```cpp
|
|
static etl::endian value()
|
|
```
|
|
`constexpr` if `ETL_CPP11_SUPPORTED == 1` and `ETL_ENDIAN_NATIVE` is defined.
|
|
|
|
|
|
## Host to network
|
|
```cpp
|
|
template <typename T>
|
|
T hton(T value)
|
|
```
|
|
**Description**
|
|
Converts `value` from host to network ordering.
|
|
|
|
## Network to host
|
|
```cpp
|
|
template <typename T>
|
|
T ntoh(T value)
|
|
```
|
|
**Description**
|
|
Converts `value` from network to host ordering. |