# Issue

*This Content is from Stack Overflow. Question asked by Matthew Joel *

So here is my template, which has a findMax function in order to find the largest rectangle object in a vector:

```
template<typename Object, typename Comparator>
const Object & findMax(const std::vector<Object> & rectangles,
Comparator cmp) {
int MAX = 0;
for(int i = 1; i < rectangles.size(); i++) {
if(cmp(rectangles[MAX], rectangles[i])) {
MAX = i;
}
}
return rectangles[MAX];
}
```

and here is the the line of code where the error occurs:

```
rectangleVec[findMax(rectangleVec,CompareArea::isLessThan)].display();
```

My display function works, and now im simply trying to display the rectangle is finds largest, but i get the error:

```
candidate function not viable: no known conversion from 'const Rectangle' to 'std::vector::size_type
```

Im stumped, what should i try?

# Solution

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