lower case only first letter of word

[kdevel]

On Tuesday, 5 December 2017 at 17:25:57 UTC, Steven Schveighoffer 
wrote:
[...]
> struct LowerCaseFirst(R) // if(isSomeString!R)
> {
>    R src;
>    bool notFirst; // terrible name, but I want default false
>    dchar front() {
>       import std.uni: toLower;
>       return notFirst ? src.front : src.front.toLower;
>    }
>    void popFront() { notFirst = true; src.popFront; }
>    bool empty() { return src.empty; }
> }
>
> auto lowerCaseFirst(R)(R r)
> {
>    return LowerCaseFirst!R(r);
> }
>
> Warning: it ain't going to be fast. Auto-decoding everywhere.

But one cannot use the return value of lowerCaseFirst as argument 
for foo(string). Only the use as argument to writeln seems to 
work. Also I had to put

     import std.range.primitives : front, popFront, empty;

outside the struct otherwise the compiler complains about missing 
front, popFront and empty for type string.