The following short code fragment no longer compiles with gcc 4.1.
I've no clue if this a regression or mandated by the standard.
#include <algorithm>
#include <string>
#include <vector>
int size(char x) { return (int) sizeof(x); }
int size(int x) { return (int) sizeof(x); }
int size(const std::string &x) {
return (int) x.size() + (int) sizeof(int);
}
template <class T>
int size(const std::vector<T> &x) {
int result = (int) sizeof(int);
typename std::vector<T>::const_iterator iter;
for (iter = x.begin() ; iter != x.end() ; iter++)
result += size(*iter);
return result;
}
template <class T, class TT>
int size(const std::pair<T,TT> &x) {
return size(x.first) + size(x.second);
}
int foo() {
std::vector<std::pair <std::string, std::string> > pvec;
return size(pvec);
}
Sorry to not reduce a stand-alone testcase without headers. The STL isn't
important. The issue is that the list of candidates for "size(std::pair<...>)"
doesn't include the templates, only the functions, when instantiating
"size(std::vector<...>).
On IRC they thought this looked reasonable enough to file a PR.
This works fine in 4.0.2 and 3.4.x and many other C++ compilers.
--
Summary: Template instantiation behavior change in 4.1
(regression?)
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: roger at eyesopen dot com
GCC host triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26080
