Re: __func__

[Jarrett Billingsley]

On Sun, Oct 4, 2009 at 5:12 PM, Zarathustra <adam.chrapkow...@gmail.com> wrote:
> Does in D exist something like __func__?
> For example in gcc:
> int main(){ printf("%s", __func__); ...}
> returns "main".
>

No.

There is a ridiculous workaround though.

// Parsing mangles for fun and profit.
char[] _getJustName(char[] mangle)
{
        size_t idx = 1;
        size_t start = idx;
        size_t len = 0;

        while(idx < mangle.length && mangle[idx] >= '0' &&
                mangle[idx] <= '9')
        {
                int size = mangle[idx++] - '0';

                while(mangle[idx] >= '0' && mangle[idx] <= '9')
                        size = (size * 10) + (mangle[idx++] - '0');

                start = idx;
                len = size;
                idx += size;
        }

        if(start < mangle.length)
                return mangle[start .. start + len];
        else
                return "";
}

const char[] FuncNameMix = "static if(!is(typeof(__FUNCTION__))) {"
"struct __FUNCTION {} const char[] __FUNCTION__ = _getJustName("
"__FUNCTION.mangleof); }";

Now you can use:

import std.stdio;
void main()
{
    mixin(FuncNameMix);
    writefln("%s", __FUNCTION__);
}

You just mix FuncNameMix into any function where you want to use __FUNCTION__.