// passing-string-literals.cpp
//
// $ g++ -std=c++17 passing-string-literals.cpp && ./a.out
// StringByValue("string literal") took 1426 cycles
// StringByConstRef("string literal") took 1412 cycles
// StringViewByValue("string literal") took 612 cycles

#include <ctime>
#include <iostream>
#include <string>
#include <string_view>

void StringByValue(std::string s) { return; }
void StringByConstRef(const std::string& s) { return; }
void StringViewByValue(std::string_view s) { return; }

int main() {
    const int iters = 100000; // try also with `iters` values of, say, 1 or 100

    auto start = clock();
    for (int it = 0; it < iters; ++it) {
        StringByValue("blockhash");
    }
    std::cout << "StringByValue(\"string literal\") took " << (clock() - start) << " cycles" << std::endl;

    start = clock();
    for (int it = 0; it < iters; ++it) {
        StringByConstRef("blockhash");
    }
    std::cout << "StringByConstRef(\"string literal\") took " << (clock() - start) << " cycles" << std::endl;

    start = clock();
    for (int it = 0; it < iters; ++it) {
        StringViewByValue("blockhash");
    }
    std::cout << "StringViewByValue(\"string literal\") took " << (clock() - start) << " cycles" << std::endl;

    return 0;
}