std::get(std::tuple)
From cppreference.com
template< std::size_t I, class... Types >
typename std::tuple_element<I, tuple<Types...> >::type& |
(1) | (since C++11) |
template< std::size_t I, class... Types >
typename std::tuple_element<I, tuple<Types...> >::type&& |
(2) | (since C++11) |
template< std::size_t I, class... Types >
typename std::tuple_element<I, tuple<Types...> >::type const& |
(3) | (since C++11) |
Extracts the Ith
element element from the tuple. I
is an integer value in [0, sizeof...(Types))
.
Contents |
[edit] Parameters
t | - | tuple whose contents to extract |
[edit] Return value
1) Reference to the Ith
element of t
.
2) Rvalue reference to the Ith
element of t
, unless the element is of lvalue reference type, in which case lvalue reference is returned.
3) Const reference to the Ith
element of t
.
[edit] Exceptions
[edit] Example
#include <iostream> #include <string> #include <tuple> int main() { auto t = std::make_tuple(1, "Foo", 3.14); std::cout << "(" << std::get<0>(t) << ", " << std::get<1>(t) << ", " << std::get<2>(t) << ")\n"; }
Output:
(1, Foo, 3.14)
[edit] See also
accesses an element of an array (function template) |
|
(C++11)
|
accesses an element of a pair (function template) |