Simplifying conversion and formatting code in Phobos

[Walter Bright via Digitalmars-d]

On 9/8/2016 5:10 AM, Andrei Alexandrescu wrote:
>> Consider the pattern of overloads:
>>
>>    template foo(T) if (condition!T) { }
>>    template foo(T) if (!condition!T) { }
>>
>> It makes condition!T a user-facing constraint, which it should not be.
>
> This looks like a nice guideline. Good work. Pushing the roof now. -- Andrei


An example of doing it better, the put() template:

     https://github.com/dlang/phobos/blob/master/std/range/primitives.d#L295

Something we need to move away from, the 17 overloads of formatValue() in:

     https://github.com/dlang/phobos/blob/master/std/format.d#L1319

all that differ only in the constraint.