[Bug c++/55015] New: Lambda functions not found at link time when declared in an inline function

["julien.nitard at m4tp dot org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55015

             Bug #: 55015
           Summary: Lambda functions not found at link time when declared
                    in an inline function
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: julien.nitard@m4tp.org


Hi all,

Following this stackoverflow question
http://stackoverflow.com/questions/13003941/lambda-not-found-when-defined-in-an-inline-function-in-g-4-7,
I was directed here to report a bug.
I have tried to find similar bugs but haven't.

Lambdas are not handled properly when declared inside inline functions (or so
it seems).

Here is a LWS link that demonstrates the error:
http://liveworkspace.org/code/35374b3c9b0d40e8ccc0819eb44d7f9e


In case the link disappears, here the source:

#include <stdexcept>
#include <string>

#include <boost/algorithm/string.hpp>

using std::string;

typedef bool (*FieldComparer)(const std::string&, const std::string&);

inline FieldComparer
GetComparer(const std::string& query, string& separator)
{
    if (query.find('=') != std::string::npos) {
        separator = "=";
        return [](const string& s1, const string& s2) { return s1 == s2; };
    }
    else if (query.find('^') != string::npos) {
        separator = "^";
        return [](const string& s1, const string& s2) { return
boost::starts_with(s1, s2); };
    }
    else if (query.find('*') != string::npos) {
        separator = "*";
        return [](const string& s1, const string& s2) { return
boost::contains(s1, s2); };
    }
    else if (query.find('!') != string::npos) {
        separator = "!";
        return [](const string& s1, const string& s2) { return s1 != s2; };
    }
    else
        throw std::invalid_argument("Search: could not find operator in query
string.");
}

int main()
{
  std::string sep;
  auto comp = GetComparer( "=", sep );
}

Many thanks,