RAII scope timer for quick profiling

#include <chrono>
#include <iostream>
#include <string>
#include <utility>

// Prints how long its scope took; copies are blocked so it fires exactly once.
class ScopeTimer {
public:
    explicit ScopeTimer(std::string label)
        : label_(std::move(label)), start_(std::chrono::steady_clock::now()) {}

    ScopeTimer(const ScopeTimer&) = delete;
    ScopeTimer& operator=(const ScopeTimer&) = delete;

    ~ScopeTimer() {
        const auto elapsed = std::chrono::steady_clock::now() - start_;
        const auto micros = std::chrono::duration_cast<std::chrono::microseconds>(elapsed);
        std::cout << label_ << " took " << micros.count() << " us\n";
    }

private:
    std::string label_;
    std::chrono::steady_clock::time_point start_;
};

int main() {
    long total = 0;
    {
        ScopeTimer timer("sum loop");
        for (long i = 0; i < 1000000; ++i) {
            total += i;
        }
    }
    std::cout << total << '\n';
}