Sure. Here is the function using templates:
```c
#include <map>
#include <utility>

// Function to return the largest pair in a map based on the second value of each pair
template <typename T>
std::pair<T, T> largest_pair(const std::map<T, T>& my_map) {
    std::pair<T, T> largest_pair = *my_map.begin();
    for (auto& entry : my_map) {
        if (entry.second > largest_pair.second) {
            largest_pair = entry;
        }
    }
    return largest_pair;
}
```
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