Document convenience load/store functions

This commit is contained in:
Peter Dimov
2019-10-12 20:25:28 +03:00
parent 4054afda70
commit 41ee26a8d8
3 changed files with 182 additions and 3 deletions

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@ -1,4 +1,7 @@
<style>
*:not(pre)>code { background: none; color: #600000; }
:not(pre):not([class^=L])>code { background: none; color: #600000; }
table tr.even, table tr.alt, table tr:nth-of-type(even) { background: none; }
</style>

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@ -10,6 +10,10 @@ http://www.boost.org/LICENSE_1_0.txt
[#changelog]
# Revision History
## Changes in 1.72.0
* Added convenience load and store functions
## Changes in 1.71.0
* Clarified requirements on the value type template parameter

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@ -56,6 +56,8 @@ namespace endian
little = `see below`,
};
// Byte reversal functions
template <class Endian>
Endian endian_reverse(Endian x) noexcept;
@ -74,6 +76,8 @@ namespace endian
EndianReversible conditional_reverse(EndianReversible x,
order order1, order order2) noexcept;
// In-place byte reversal functions
template <class EndianReversible>
void endian_reverse_inplace(EndianReversible& x) noexcept;
@ -92,12 +96,88 @@ namespace endian
void conditional_reverse_inplace(EndianReversibleInplace& x,
order order1, order order2) noexcept;
// Generic load and store functions
template<class T, std::size_t N, order Order>
T endian_load( unsigned char const * p ) noexcept;
template<class T, std::size_t N, order Order>
void endian_store( unsigned char * p, T const & v ) noexcept;
// Convenience load functions
boost::int16_t load_little_s16( unsigned char const * p ) noexcept;
boost::uint16_t load_little_u16( unsigned char const * p ) noexcept;
boost::int16_t load_big_s16( unsigned char const * p ) noexcept;
boost::uint16_t load_big_u16( unsigned char const * p ) noexcept;
boost::int32_t load_little_s24( unsigned char const * p ) noexcept;
boost::uint32_t load_little_u24( unsigned char const * p ) noexcept;
boost::int32_t load_big_s24( unsigned char const * p ) noexcept;
boost::uint32_t load_big_u24( unsigned char const * p ) noexcept;
boost::int32_t load_little_s32( unsigned char const * p ) noexcept;
boost::uint32_t load_little_u32( unsigned char const * p ) noexcept;
boost::int32_t load_big_s32( unsigned char const * p ) noexcept;
boost::uint32_t load_big_u32( unsigned char const * p ) noexcept;
boost::int64_t load_little_s40( unsigned char const * p ) noexcept;
boost::uint64_t load_little_u40( unsigned char const * p ) noexcept;
boost::int64_t load_big_s40( unsigned char const * p ) noexcept;
boost::uint64_t load_big_u40( unsigned char const * p ) noexcept;
boost::int64_t load_little_s48( unsigned char const * p ) noexcept;
boost::uint64_t load_little_u48( unsigned char const * p ) noexcept;
boost::int64_t load_big_s48( unsigned char const * p ) noexcept;
boost::uint64_t load_big_u48( unsigned char const * p ) noexcept;
boost::int64_t load_little_s56( unsigned char const * p ) noexcept;
boost::uint64_t load_little_u56( unsigned char const * p ) noexcept;
boost::int64_t load_big_s56( unsigned char const * p ) noexcept;
boost::uint64_t load_big_u56( unsigned char const * p ) noexcept;
boost::int64_t load_little_s64( unsigned char const * p ) noexcept;
boost::uint64_t load_little_u64( unsigned char const * p ) noexcept;
boost::int64_t load_big_s64( unsigned char const * p ) noexcept;
boost::uint64_t load_big_u64( unsigned char const * p ) noexcept;
// Convenience store functions
void store_little_s16( unsigned char * p, boost::int16_t v ) noexcept;
void store_little_u16( unsigned char * p, boost::uint16_t v ) noexcept;
void store_big_s16( unsigned char * p, boost::int16_t v ) noexcept;
void store_big_u16( unsigned char * p, boost::uint16_t v ) noexcept;
void store_little_s24( unsigned char * p, boost::int32_t v ) noexcept;
void store_little_u24( unsigned char * p, boost::uint32_t v ) noexcept;
void store_big_s24( unsigned char * p, boost::int32_t v ) noexcept;
void store_big_u24( unsigned char * p, boost::uint32_t v ) noexcept;
void store_little_s32( unsigned char * p, boost::int32_t v ) noexcept;
void store_little_u32( unsigned char * p, boost::uint32_t v ) noexcept;
void store_big_s32( unsigned char * p, boost::int32_t v ) noexcept;
void store_big_u32( unsigned char * p, boost::uint32_t v ) noexcept;
void store_little_s40( unsigned char * p, boost::int64_t v ) noexcept;
void store_little_u40( unsigned char * p, boost::uint64_t v ) noexcept;
void store_big_s40( unsigned char * p, boost::int64_t v ) noexcept;
void store_big_u40( unsigned char * p, boost::uint64_t v ) noexcept;
void store_little_s48( unsigned char * p, boost::int64_t v ) noexcept;
void store_little_u48( unsigned char * p, boost::uint64_t v ) noexcept;
void store_big_s48( unsigned char * p, boost::int64_t v ) noexcept;
void store_big_u48( unsigned char * p, boost::uint64_t v ) noexcept;
void store_little_s56( unsigned char * p, boost::int64_t v ) noexcept;
void store_little_u56( unsigned char * p, boost::uint64_t v ) noexcept;
void store_big_s56( unsigned char * p, boost::int64_t v ) noexcept;
void store_big_u56( unsigned char * p, boost::uint64_t v ) noexcept;
void store_little_s64( unsigned char * p, boost::int64_t v ) noexcept;
void store_little_u64( unsigned char * p, boost::uint64_t v ) noexcept;
void store_big_s64( unsigned char * p, boost::int64_t v ) noexcept;
void store_big_u64( unsigned char * p, boost::uint64_t v ) noexcept;
} // namespace endian
} // namespace boost
```
@ -184,7 +264,7 @@ perform reversal of endianness if needed by making an unqualified call to
See `example/udt_conversion_example.cpp` for an example user-defined type.
### Functions
### Byte Reversal Functions
```
template <class Endian>
@ -251,7 +331,10 @@ EndianReversible conditional_reverse(EndianReversible x,
[none]
* {blank}
+
Returns:: `order1 == order2? x: endian_reverse(x)`.
Returns::
`order1 == order2? x: endian_reverse(x)`.
### In-place Byte Reversal Functions
```
template <class EndianReversible>
@ -316,7 +399,10 @@ void conditional_reverse_inplace(EndianReversibleInplace& x,
[none]
* {blank}
+
Effects:: If `order1 == order2` then `endian_reverse_inplace(x)`.
Effects::
If `order1 == order2` then `endian_reverse_inplace(x)`.
### Generic Load and Store Functions
```
template<class T, std::size_t N, order Order>
@ -350,6 +436,92 @@ Effects:: Writes to `p` the `N` least significant bytes from the object
representation of `v`, in forward or reverse order depending on whether
`Order` matches the native endianness or not.
### Convenience Load Functions
```
inline boost::intM_t load_little_sN( unsigned char const * p ) noexcept;
```
[none]
* {blank}
+
Reads an N-bit signed little-endian integer from `p`.
+
Returns:: `endian_load<boost::intM_t, N/8, order::little>( p )`.
```
inline boost::uintM_t load_little_uN( unsigned char const * p ) noexcept;
```
[none]
* {blank}
+
Reads an N-bit unsigned little-endian integer from `p`.
+
Returns:: `endian_load<boost::uintM_t, N/8, order::little>( p )`.
```
inline boost::intM_t load_big_sN( unsigned char const * p ) noexcept;
```
[none]
* {blank}
+
Reads an N-bit signed big-endian integer from `p`.
+
Returns:: `endian_load<boost::intM_t, N/8, order::big>( p )`.
```
inline boost::uintM_t load_big_uN( unsigned char const * p ) noexcept;
```
[none]
* {blank}
+
Reads an N-bit unsigned big-endian integer from `p`.
+
Returns::
`endian_load<boost::uintM_t, N/8, order::big>( p )`.
### Convenience Store Functions
```
inline void store_little_sN( unsigned char * p, boost::intM_t v ) noexcept;
```
[none]
* {blank}
+
Writes an N-bit signed little-endian integer to `p`.
+
Effects:: `endian_store<boost::intM_t, N/8, order::little>( p, v )`.
```
inline void store_little_uN( unsigned char * p, boost::uintM_t v ) noexcept;
```
[none]
* {blank}
+
Writes an N-bit unsigned little-endian integer to `p`.
+
Effects:: `endian_store<boost::uintM_t, N/8, order::little>( p, v )`.
```
inline void store_big_sN( unsigned char * p, boost::intM_t v ) noexcept;
```
[none]
* {blank}
+
Writes an N-bit signed big-endian integer to `p`.
+
Effects:: `endian_store<boost::intM_t, N/8, order::big>( p, v )`.
```
inline void store_big_uN( unsigned char * p, boost::uintM_t v ) noexcept;
```
[none]
* {blank}
+
Writes an N-bit unsigned big-endian integer to `p`.
+
Effects::
`endian_store<boost::uintM_t, N/8, order::big>( p, v )`.
## FAQ
See the <<overview_faq,Overview FAQ>> for a library-wide FAQ.