https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86908
Bug ID: 86908
Summary: static_cast<BaseTypeWithVirtualMethod*>(&derivedClassO
bject)->virtualMehod() calls base version of
virtualMethod()
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fro0m.spam at gmail dot com
Target Milestone: ---
#include <cstdio>
#include <time.h>
#include <stdlib.h>
#include <new>
class BaseStrategy{
public:
virtual void doIt() {
printf("base do it\n");
};
};
class AStrategy : public BaseStrategy
{
public:
void doIt() {
printf("A do it\n");
};
};
class BStrategy : public BaseStrategy
{
public:
void doIt() {
printf("B do it\n");
};
};
int main()
{
BaseStrategy strategy;
BaseStrategy* strategyPtr = &strategy;
strategyPtr->doIt();
new(&strategy) AStrategy;
static_cast<BaseStrategy*>(&strategy)->doIt();
strategyPtr->doIt();
}
Output in gcc 4.9 and gcc 9.0 is
base do it
base do it
A do it
the right output must be (according to standard and behavior of MSVC 2015 and
clang 6) is
base do it
A do it
A do it
