You can hide the #ifdef #pragma soup underneath macros ( https://godbolt.org/z/bj7dG8 ):

bool test_size() {
    std::size_t s{0};
    IGNORE_DEPRECATED(
        return 0 == size(s) && s != 0;
    )
}

Regards,
Justin Bassett

On Thu, Jan 28, 2021 at 3:05 AM Dominic Fandrey via Std-Proposals <std-proposals@lists.isocpp.org> wrote:
I recently ran into this issue:

1. Marked a set of legacy methods [[deprecated]]
2. Unit tests no longer compile (we run -Wall -Werror of course)

Of course I don't want to get rid of the unit tests before I get rid of the
functions. So I was faced with two choices:

1. Create #ifdef #pragma soup for all 3 compilers that we use
2. Remove [[deprecated]]

The #ifdef #pragma soup needs to be updated every time a compiler is added,
and it bloats the code and makes unit tests more difficult to read. So I
went for option 2. As long as I cannot ignore [[deprecated]] in a portable
manner I cannot use it.

So my suggestion is:

```
[[deprecated("use: std::optional<std::size_t> size()")]]int size(std::size_t & size);


bool test_size() {
        std::size_t s{0};
        return 0 == [[deprecated]]size(s) && s != 0;
}
```

Regards
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