Re: How to forward format specifiers ?

[Ali Çehreli via Digitalmars-d-learn]

On 06/29/2014 04:55 AM, Element 126 wrote:

> I've certainly missed something

formatValue passes your tests:

import std.stdio;
import std.format: formattedWrite, FormatSpec, formatValue;
import std.string: format;

struct wrapper(T) {

    private T val;

    public this(T newVal) pure { val = newVal; }

    public void toString(
        scope void delegate(const(char)[]) sink,
        FormatSpec!char fmt
    ) const
    {
        formatValue(sink, val, fmt);    // <-- HERE
    }
}

unittest {

    immutable uint base = 16;
    auto a = wrapper!uint(base);
    assert(format("%x", a) == format("%x", base));
    assert(format("%08x", a) == format("%08x", base));
}

void main()
{}

Ali