View source code
Display the source code in std/variant.d from which thispage was generated on github.
Report a bug
If you spot a problem with this page, click here to create aBugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page.Requires a signed-in GitHub account. This works well for small changes.If you'd like to make larger changes you may want to consider usinglocal clone.

Enum member std.variant.maxSize

Gives the sizeof the largest type given.

enum maxSize(Ts...) = Impl.sizeof;

See Also

https://forum.dlang.org/thread/wbpnncxepehgcswhuazl@forum.dlang.org?page=1

Example

struct Cat { int a, b, c; }

align(1) struct S
{
    long l;
    ubyte b;
}

align(1) struct T
{
    ubyte b;
    long l;
}

static assert(maxSize!(int, long) == 8);
static assert(maxSize!(bool, byte) == 1);
static assert(maxSize!(bool, Cat) == 12);
static assert(maxSize!(char) == 1);
static assert(maxSize!(char, short, ubyte) == 2);
static assert(maxSize!(char, long, ubyte) == 8);
import std.algorithm.comparison : max;
static assert(maxSize!(long, S) == max(long.sizeof, S.sizeof));
static assert(maxSize!(S, T) == max(S.sizeof, T.sizeof));
static assert(maxSize!(int, ubyte[7]) == 7);
static assert(maxSize!(int, ubyte[3]) == 4);
static assert(maxSize!(int, int, ubyte[3]) == 4);
static assert(maxSize!(void, int, ubyte[3]) == 4);
static assert(maxSize!(void) == 1);

Authors

Andrei Alexandrescu

License

Boost License 1.0.