Default-valued nothrow @nogc std.conv:to

[Stanislav Blinov via Digitalmars-d]

On Saturday, 22 April 2017 at 16:41:00 UTC, Nordlöw wrote:

>> If defaultValue is not lazy, it's potentially wasteful.
>
> What do you mean with "potentially wasteful"?
>
> Excess calls to copy constructors?

Evaluation of an expression the result of which might not be 
used. defaultValue could be anything: a literal, an lvalue, a 
result of a function call...