Assert if temporary objects that are still referred to get destructed (was: Misbehaving Product on C++11)

Submitted by bre..@..il.com

Assigned to Nobody

This very well could be a GCC 4.7 -std=c++11 issue, but here is the code and output:

#include <iostream>

#include <Eigen/Dense>

using namespace std;

using namespace Eigen;

template<class A, class B, class C>

double combine(const A& a, const B& b, const C& c)

{

auto result = a*b-c;  

cout << result << endl;  

return result(0,0);

}

int main()

{

Matrix<double,1,1> X, y, w, g;  

X << 4;  

y << 2;  

w << 4;  

  

cout << combine(X,y,w) << endl;  

cout << X*y-w << endl;  



return 0;

}

Build:

g++ -c -O3 -Wall -Ic:/C++/include -std=c++11 main.cpp -o main.o

g++ -Lc:/C++/lib main.o -lgtest -o main.exe

rm main.o

Output:

-4

Error goes away when I remove -O3.