[Bug c++/55367] New: Probably problem with c++ vptr under templates and multiple ihenritance

[wriabi at email dot com]

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: unassig...@gcc.gnu.org

        ReportedBy: wri...@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;

}