How to specify number of times a value can be repeated

[mpflanzer]

What is the best way to achieve a command line like the following:

exe fetch <origin> <origin> <origin>

The number of origins should be fixed to a given number.

The only way I could come up with after reading the documentation would be something like this:

std::string origin1, origin2, origin3;
command("fetch"), value("origin", origin1), value("origin", origin2), value("origin", origin3)

Is there any better way as this feels a bit clumsy? I was expecting something along these lines:

std::vector<std::string> origins;
command("fetch"), values(3, "origin", origins)