std.conv.to purity

[ketmar via Digitalmars-d-learn]

On Sat, 14 Feb 2015 11:29:28 +0000, Jack Applegame wrote:

> why std.conv.to is not pure?
> 
> string foo(real v) pure { return v.to!string; }
> // Error: pure function 'foo' cannot call impure function
> 'std.conv.to!string.to!(real).to'

'cause float->string conversion is damned hard task. to perform this 
conversion `to!` falls back to `formatValue` from "std.format", which in 
turn using `snprintf()` from libc.
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