Function computeSomethingSlowly

CesiumAsync/test/ExamplesAsyncSystem.cpp:122–126

struct SlowValue {};
void computeSomethingSlowly(
    const std::string& /*parameter*/,
    std::function<void(const SlowValue&)> f) {
  f(SlowValue());
}

template <typename T> void doSomething(const T&) {}