Akim Demaille writes:

Hi all, Hi Joaquin,

I'm using flyweights of strings (aka symbols) for my "format" arguments: a key that specifies the kind of output that should be produced by the printing routines.

Sometimes, I have code that roughly resembles to:

print_entry_(src, dst, o, dot2tex_ ? symbol("latex") : symbol("text"));

My question is: do we have constexpr constructors with Flyweight in such a way that I could have something like:

print_entry_(src, dst, o, dot2tex_ ? "latex"sym : "text"sym);

and have a single construction of these guys not matter how many times I go throw this piece of code, or should I build them once for all in say a member?

print_entry_(src, dst, o, dot2tex_ ? sym_latex : sym_text);

boost::flyweight can't have a constexpr ctor because it's not a literal type (and can't be made one). "latex"sum would work the same way as "latex"s produces a std::string yet it's not constexpr. Joaquín M López Muñoz Telefónica