set cpp [C++]
$cpp cflags -std=c++11
$cpp include <vector>
$cpp proc addInCpp {int a int b} int {
    std::vector<int> xs = {a, b};
    int sum = 0;
    for (int x : xs) {
        sum += x;
    }
    return sum;
}
set cppLib [$cpp compile]
assert {[+ 10 3] == [$cppLib addInCpp 10 3]}
Exit! 0