Work with char array with stack alignment problems

Question

See: Posting a new problem

A simple question: will the alignment issue fix?

union
{
    char real_array[sizeof(T)*size];
    T    fake_array[size];
};

Answer 1

Yes, this should solve the alignment problem. However, there is no need to create an fake_arrayarray. One member of the type is enough T.

This is actually a fairly widely used trick to force alignment of a specific array.

As a pedantic side: anonymous unions exist only in C ++, but not in C.

Answer 2

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Answer 3

, .

union
{
    char real_array[sizeof(T)*size];
    T    dummy;
};

, ISO , .

: POD-union POD- , POD-union POD-, POD-;

However, as the standard says, you might wonder if there is any loophole leading to Undefined Behavior if you use non-POD classes ... (but I bet it will work with any compiler anyway).