table of contents
std::max_align_t(3) | C++ Standard Libary | std::max_align_t(3) |
NAME¶
std::max_align_t - std::max_align_t
Synopsis¶
Defined in header <cstddef>
typedef /*implementation-defined*/ max_align_t; (since C++11)
std::max_align_t is a trivial standard-layout type whose alignment
requirement is at
least as strict (as large) as that of every scalar type.
Notes¶
Pointers returned by allocation functions such as std::malloc are
suitably aligned
for any object, which means they are aligned at least as strictly as
std::max_align_t.
std::max_align_t is usually synonymous with the largest scalar type, which is
long
double on most platforms, and its alignment requirement is either 8 or
16.
Example¶
// Run this code
#include <iostream>
#include <cstddef>
int main()
{
std::cout << alignof(std::max_align_t) << '\n';
}
Possible output:¶
16
References¶
* C++20 standard (ISO/IEC 14882:2020):
* 17.2.4 Sizes, alignments, and offsets [support.types.layout] (p:
507-508)
* C++17 standard (ISO/IEC 14882:2017):
* 21.2.4 Sizes, alignments, and offsets [support.types.layout] (p: 479)
* C++14 standard (ISO/IEC 14882:2014):
* 18.2 Types [support.types] (p: 443-444)
* C++11 standard (ISO/IEC 14882:2011):
* 18.2 Types [support.types] (p: 454-455)
See also¶
alignof operator(C++11) queries alignment requirements of
a type
alignment_of obtains the type's alignment requirements
(C++11) (class template)
is_scalar checks if a type is a scalar type
(C++11) (class template)
2022.07.31 | http://cppreference.com |