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version 2.110.0

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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.