"iterator on std::tuple" Code Answer's
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iterator on std::tuple
Foolish Frog
on Nov 10, 2020
#include <tuple>
#include <iostream>
int main()
{
std::tuple t{42, 'a', 4.2}; // Another C++17 feature: class template argument deduction
std::apply([](auto&&... args) {((std::cout << args << '\n'), ...);}, t);
}
Source: stackoverflow.com
iterator on std::tuple
Foolish Frog
on Nov 10, 2020
{
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
Foolish Frog
on Nov 10, 2020
#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
Foolish Frog
on Nov 10, 2020
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
Foolish Frog
on Nov 10, 2020
#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
Foolish Frog
on Nov 10, 2020
std::apply([](auto ...x){std::make_tuple(x.do_something()...);} , the_tuple);
Source: stackoverflow.com
iterator on std::tuple
Foolish Frog
on Nov 10, 2020
// 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
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