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Subject: [Bug c++/55367] New: Probably problem with c++ vptr under templates and multiple ihenritance
Date: Sat, 17 Nov 2012 16:22:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55367

             Bug #: 55367
           Summary: Probably problem with c++ vptr under templates and
                    multiple ihenritance
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: wriabi@email.com


Created attachment 28720
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28720
code snippet

Hello,
I have some code that compile and work fine in gcc 4.6.2 (without tne new
keyword "override" ) but in version 4.7.2 it complie generate access violation
runtime. under windows platform.

So, i need some help, thank you very much:

#include <iostream>
using namespace std;

struct Entity {
    //~Entity() = default; //work fine
    ~Entity() {} //when i specified my destructor this compile but generate
runtime access viloation
};

template<typename T>
struct IRepository { virtual T g() = 0; };

struct OtherInterface{ virtual void y() = 0; };

struct IEntityRepository : public virtual IRepository<Entity>{ };

template<typename T>
struct RepositoryBase : public virtual IRepository<T>, public OtherInterface{
    virtual void y()  override { cout << "y() override called" << endl; }
};

template<typename T>
struct DataRepository : public RepositoryBase<T>{
    virtual T f() { cout << "f() called" << endl; this->y(); T t; return t; }
        T g() override {
        cout << "g() override called" << endl;
        ////when i specified my destructor for class Entity this compile but
generate runtime access viloation here : on this: probably problem with vptr
        return this->f(); }
};

struct EffectiveEntityRepository : public DataRepository<Entity>, public
IEntityRepository{
};

int main() {
    IEntityRepository* var = new EffectiveEntityRepository();
    var->g();
    return 1;
}