Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <initializer_list>

// Function accepting initialiser list
double average(std::initializer_list<double> values) {
    double sum = 0;
    for (double v : values) sum += v;
    return sum / values.size();
}

class Config {
public:
    // Initialiser-list constructor
    Config(std::initializer_list<std::pair<std::string,std::string>> pairs) {
        for (const auto& [key, val] : pairs)
            data_[key] = val;
    }
    std::string get(const std::string& key) const {
        auto it = data_.find(key);
        return it != data_.end() ? it->second : "";
    }
private:
    std::map<std::string, std::string> data_;
};

int main() {
    // auto: type deduced from initialiser
    auto x = 42;
    auto pi = 3.14159;
    auto msg = std::string("hello");

// Brace-init: no narrowing conversions allowed
    std::vector<int> v = {1, 2, 3, 4, 5};
    std::map<std::string, int> scores = {{"Alice", 95}, {"Bob", 87}};

// Range-for with const auto& (no copy)
    std::cout << "Scores:
";
    for (const auto& [name, score] : scores)
        std::cout << "  " << name << ": " << score << "
";

// Initialiser list in function call
    std::cout << "avg = " << average({1.0, 2.0, 3.0, 4.0, 5.0}) << "
";

// Config with initialiser-list constructor
    Config cfg = {{"host", "localhost"}, {"port", "8080"}};
    std::cout << "host=" << cfg.get("host")
              << " port=" << cfg.get("port") << "
";

return 0;
}