[Boost-users] Boost.Variant: char[], a bool or std::string ?

I sort of guessed that this implicit conversion was taking place ... but unfortunatley it wil make my variant very error prone .. and on the other hand I do want the capability to construct from a C string appropriatley. I think one possible soultion would be to derive from boost::variant and put in an explicit constructor for const char *, this will also let me get around other similar problems. However deriving from boost::variant .... ??? not sure how healthy that is.

To answer the question in the subject line: char* isn't bool, but it's implicitly convertible to bool, which is probably (haven't really checked, just an educated guess) what's causing you trouble.

Nindi wrote:

...

When I have a Boost.Variant templated on a bool and a std::string, I get the following behaviour ..

#include<string>

#include .> typedef boost::variant< bool,std::string> BoostVariant;

int main () {

BoostVariant v("A String");

bool &Bref(boost::get(v)); // this is ok

std::string &Sref(boost::getstd::string&(v)); // But this throws

return 0;

}

Instead of BoostVariant v("A String"); try BoostVariant v(std::string("A String"));

I think it will solve your problems.