GCC internal error using lambda expressions

Question

Could anyone give me a hint why this code produces an internal compiler error? I've tested it on gcc 4.8.1.

#include <functional>
#include <algorithm>
#include <iostream>
#include <vector>

class Dummy {
private:
    int dummy;
public:
    Dummy() { dummy = 0; }
    ~Dummy() { }
    int getDummy() const { return dummy; }
    void setDummy(int d) { dummy = d; }
};

class DummyCollection {
private:
    std::vector<Dummy> table;

public:
    void eachDummy(std::function<bool (const Dummy& d)>& closure) {
        for(const Dummy& d: table) {
            if(! closure(d))
                break;
        }
    }
};

DummyCollection dc;

void iterateDummies(std::function<bool (const Dummy& d)>& closure) {
    dc.eachDummy([&] (const Dummy& d) {
        return closure(d);
    });
}

int main() {
    iterateDummies([&] (const Dummy& d) {
        std::cout << "dummy " << d.getDummy() << std::endl;
        return true;
    });

    return 0;
}

Here's the compiler output:

(2:514)$ g++ test.cpp -o test -std=c++11
test.cpp: In lambda function:
test.cpp:34:2: internal compiler error: in pop_binding, at cp/name-lookup.c:382
  });
  ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.

Line 34 is the end of the iterateDummies function. It seems that lambda function can't be called from another lambda function, is this true?

Phil Miller · Accepted Answer · 2013-06-17 00:01:01Z

1

As the output notes, this is not necessarily a defect in your code - the compiler developers have some sort of defect to deal with. You should follow the bug report instructions as linked.

answered Jun 17, 2013 at 0:01

Phil Miller

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1 Comment

antekone Over a year ago

Yes, I only wanted to confirm that. I always search for my errors first when dealing with this kind of problems.

antekone · Accepted Answer · 2013-06-17 10:07:42Z

1

I've reported this to ArchLinux bugzilla and got this answer, so I'm going to paste it here for other googlers' benefit:

https://bugs.archlinux.org/task/35803

gcc-4.9-20130324 BAD
gcc-4.9-20130331 GOOD

answered Jun 17, 2013 at 10:07

antekone

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