利用函数参数包自动展开功能巧妙打印数据

// 1.展开模板参数包
template<typename ... Ts>
auto print_template_direct()
{
    return std::initializer_list<int>{(cout<<typeid(Ts).name()<<endl, 0)...};
}

template<typename ... Ts>
auto print_template_bylambda()
{
    return [=](){ std::initializer_list<int>{(cout<<typeid (Ts).name()<<"\n",0)...};};
}

// 2.展开函数参数包
template<typename ...T>
auto print_variables_direct(T... args)
{
    return std::initializer_list<int>{
        ( cout << (std::is_same_v<decltype(args), bool> ? std::boolalpha : std::noboolalpha) << args << "\n", 0)...};
}

template<typename ...T>
auto print_variables_bylambda(T... args)
{
    return [=](){ std::initializer_list<int>{( cout << (std::is_same_v<decltype(args), bool> ? std::boolalpha : std::noboolalpha) << args << "\n", 0)...};};
}

int main(int argc, char *argv[])
{
    print_template_direct<int, double, long>();
    print_template_bylambda<int, double, long>()();

    cout << "--------------------------------------------" << endl;

    print_variables_direct('a', true, 6, 'k', "祖国越来越强");

    print_variables_bylambda('a', true, 6, 'k', "祖国越来越强")();
    return 0;
}

打印结果

i
d
l
i
d
l
--------------------------------------------
a
true
6
k
祖国越来越强
a
true
6
k
祖国越来越强