Idiom #109 Number of bytes of a type

Set n to the number of bytes of a variable t (of type T).

Perl

use Devel::Size qw(total_size);
my $n = total_size $t;

N : Integer := (T'Size + 7) / 8;

n = sizeof (t);

#include <cstddef>

std::size_t n = sizeof(t);

using System.Runtime.InteropServices;

int n = Marshal.SizeOf(t);

Demo
Doc

int n;
unsafe
{
    n = sizeof(T);
}

int n = sizeof(T);

Demo
Doc

auto n = T.sizeof;

use iso_c_binding

n = c_sizeof(i)

import "reflect"

var t T
tType := reflect.TypeOf(t)
n := tType.Size()

Demo
Doc

<T> int bytes(T t) {
    return switch (t.getClass().getSimpleName()) {
        case "Boolean" -> 1;
        case "Byte" -> Byte.BYTES;
        case "Short" -> Short.BYTES;
        case "Character" -> Character.BYTES;
        case "Integer" -> Integer.BYTES;
        case "Float" -> Float.BYTES;
        case "Long" -> Long.BYTES;
        case "Double" -> Double.BYTES;
        default -> -1;
    };
}