It seems that template function overloading/argument dependent lookup now
depends on declaration order. If this is right or not I don't know yet, but it
changed without notice. consider this small piece of code:
#include <string>
#include <iostream>
#include <sstream>
template<typename T> void add_field(T const & value) {
static int counter;
std::cout << "template \n";
if (++counter < 5) {// avoid crash!!
std::stringstream tmp;
tmp << value;
add_field(tmp.str());
} else {
std::cout << "would crash here \n";
}
}
// put this before the template and get desired behaviour
void add_field(std::string const &value) {
std::cout << "overload\n";
}
int main () {
add_field ( "value");
return 0;
}
on g++ < 4.1.0 (tested with 3.2.3, 3.3.2, 3.4.3 and 4.0.2) this program prints:
template
overload
while on 4.1.0 it prints
/a.out
template
template
template
template
template
template
would crash here
Changing the order of the two functions restores the old behaviour, but I'd say
this is a regression.
--
Summary: [4.1/4.2 Regression] template/overloaded function lookup
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: Michael dot Teske at swissrisk dot com
GCC host triplet: i386-redhat-linux/sparc-sun-solaris2.8
GCC target triplet: i386-redhat-linux/sparc-sun-solaris2.8
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26916
