Syntax for std::bit_cast to an array

Question

#include <bit>
#include <array>

struct A {
    int a[100];
};
struct B {
    short b[200];
};

void test(const A &in) {
    const auto x = std::bit_cast<short[200]>(in); // error: no matching function for call to 'bit_cast<short int [200]>(const A&)
    const auto y = std::bit_cast<B>(in); // OK
    const auto z = std::bit_cast<std::array<short, 200>>(in); // OK
}

The initialization of x is not working, I am curious if there is a syntax to std::bit_cast to an array without extra struct, std::array, memcpy or similar helper functions.

Thanks.

But if the short is smaller than an int you can't do a bit cast. — doctorlove
– doctorlove, Commented Oct 3, 2022 at 13:14

Davis Herring · Accepted Answer · 2022-10-03 13:27:36Z

4

Not even std::bit_cast can return an array, so wrapping in a class (perhaps std::array) is the best you can do.

answered Oct 3, 2022 at 13:27

Davis Herring

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