Features related to Standard header <cstddef>.

Interfaces

Features included in this section and mapped to global nsmespace or std:::

max_align_t (C++11)
std::byte , to_integral() (C++17)

Non-backport features (cxxomfort::fix):

to_byte() - obtain a std::byte value for a given integral.
to_integer() - obtain the value of a std::byte.
to_value() - overload synonym for to_integral(std::byte).

Other features:

ssize_t - This signed type is defined for non-POSIX systems, see LWG2251 "ssize_t" .

Implementation Macros

std::byte implementation level: CXXOMFORT_IMPLEMENTS_std_byte
ssize_t implementation level: CXXOMFORT_IMPLEMENTS_ssize_t

std::byte conversions

C++17's byte can not be directly initialized with integral values in C++14 or previous due to the requirements on conversions to enum class types. The cxxomfort library exposes the following names under cxxomfort::fix in order to work with variables of type std::byte :

byte b = cxxomfort::fix::to_byte('c'); // creates byte from uchar

unsigned d = cxxomfort::fix::to_value(b); // converts to uchar

See also: "Implementation Fixes"

LWG2251 "ssize_t"

POSIX systems expose the ssize_t type which is essentially a signed version of size_t . This type is exposed by cxxomfort when available, otherwise it's calculated from already existing types as basically make_signed<size_t>::type.

See also: WG21 index lwg2251 for the formal definition of ssize_t .

The macro CXXOMFORT_IMPLEMENTS_ssize_t informs how this fetaure is provided:

>= CXXO_IMPLSTATUS_NATIVE() - if ssize_t already exists in the system headers (POSIX or otherwise).
>= CXXO_IMPLSTATUS_BACKPORT() - if cxxomfort provides it.
== 0 - if it can not be added.

Interfaces

std::byte conversions

LWG2251 "ssize_t"

See Also