Iterator on std::tuple

{
    auto tup = std::make_tuple(0, 'a', 3.14);
    template for (auto elem : tup)
        std::cout << elem << std::endl;
}

Source: stackoverflow.com

Iterator on std::tuple

#include <tuple>
#include <utility>

template<std::size_t N>
struct tuple_functor
{
    template<typename T, typename F>
    static void run(std::size_t i, T&& t, F&& f)
    {
        const std::size_t I = (N - 1);
        switch(i)
        {
        case I:
            std::forward<F>(f)(std::get<I>(std::forward<T>(t)));
            break;

        default:
            tuple_functor<I>::run(i, std::forward<T>(t), std::forward<F>(f));
        }
    }
};

template<>
struct tuple_functor<0>
{
    template<typename T, typename F>
    static void run(std::size_t, T, F){}
};

Source: stackoverflow.com

Iterator on std::tuple

std::apply([](auto ...x){std::make_tuple(x.do_something()...);} , the_tuple);

Source: stackoverflow.com

Iterator on std::tuple

#include <tuple>
#include <iostream>
#include <boost/hana.hpp>
#include <boost/hana/ext/std/tuple.hpp>

struct Foo1 {
    int foo() const { return 42; }
};

struct Foo2 {
    int bar = 0;
    int foo() { bar = 24; return bar; }
};

int main() {
    using namespace std;
    using boost::hana::for_each;

    Foo1 foo1;
    Foo2 foo2;

    for_each(tie(foo1, foo2), [](auto &foo) {
        cout << foo.foo() << endl;
    });

    cout << "foo2.bar after mutation: " << foo2.bar << endl;
}

Source: stackoverflow.com

Iterator on std::tuple

template <size_t ...I>
struct index_sequence {};

template <size_t N, size_t ...I>
struct make_index_sequence : public make_index_sequence<N - 1, N - 1, I...> {};

template <size_t ...I>
struct make_index_sequence<0, I...> : public index_sequence<I...> {};

Source: stackoverflow.com

Iterator on std::tuple

// prints every element of a tuple
template<size_t I = 0, typename... Tp>
void print(std::tuple<Tp...>& t) {
    std::cout << std::get<I>(t) << " ";
    // do things
    if constexpr(I+1 != sizeof...(Tp))
        print<I+1>(t);
}

Source: stackoverflow.com

Similar codes

0 vote292 views1 answer
How to make calculaor in c++
C++
0 vote296 views1 answer
What is handling null terminated string in c++
C++
0 vote305 views1 answer
Cin does not wait for input
C++
1 vote298 views1 answer
In c++ ++ how to write if without if
C++
29 votes305 views6 answers
How to convert string to int in c++
C++
0 vote261 views5 answers
C to c++ code converter
C++
1 vote313 views2 answers
C++ random between two values
C++
0 vote277 views7 answers
C code to mips assembly converter online
C++
1 vote304 views1 answer
C++ 20 struct initialization
C++
0 vote284 views1 answer
Apply pca to dataframe
C++