Ben Hutchings ha escrito:

Joaquín Mª López Muñoz <joaquin@tid.es> wrote:

...

The following programs does not compile with error

foo.cpp: In function `int main()': foo.cpp:11: no matching function for call to `foo(std::string)'

Program code:

#include <boost/call_traits.hpp> #include <string>

template<typename Type> void foo(typename boost::call_traits<Type>::param_type x) { }

int main() { foo(std::string("bar"));

return 0; }

Environment is GCC 3.2 20020927 (prerelease) under Cygwin. Anyvody run into a similar problem? Workarounds, ideas? Thanx in advance.

This is standard behaviour. See my explanation in <http://groups.google.com/groups?selm=slrnbisehj.1pc.do-not-spam-benh%40tin.bwsint.com>.

Thanks for the URL. Gotta look the section of the std you refer to.

Without knowing what it is you are trying to do, I cannot offer a workaround.

With pleasure. My original design was template<typename Type> void foo(const Type& x) { } (of course the actual code does something useful) and I wanted to take advantage of the call_traits<>::param_type optimization for basic types. So, no way? Should I revert to const Type&? Some clever workaround to help the compiler swallow the construct? Thx in advance. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo