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Returns a reference to the Ith element of tuple tpl.
Version (2), which takes an rvalue reference of a tuple as argument, applies forward to the returned element.
Version (3), which takes a const tuple as argument, returns a const reference to the element.
get can also be used on tuple-like objects like pair and array (see pair's and array's specializations).
Notice that get uses a template parameter, I, to determine which element to be gotten. Template parameters must be constexpr (compile-time const values).
tuple_element< I, tuple<Types...> >::type is the type of the Ith element in the tuple.
Output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<tuple>
classes
-
tupleC++11
-
tuple_elementC++11
-
tuple_sizeC++11
-
functions
-
forward_as_tupleC++11
-
getC++11
-
make_tupleC++11
-
tieC++11
-
tuple_catC++11
-
objects
-
ignoreC++11
-
function template
<tuple>
std::get
| (1) | template <size_t I, class... Types>typename tuple_element< I, tuple<Types...> >::type& get(tuple<Types...>& tpl) noexcept; |
|---|---|
| (2) | template <size_t I, class... Types>typename tuple_element< I, tuple<Types...> >::type&& get(tuple<Types...>&& tpl) noexcept; |
| (3) | template <size_t I, class... Types>typename tuple_element< I, tuple<Types...> >::type const& get(const tuple<Types...>& tpl) noexcept; |
Get element
Version (2), which takes an rvalue reference of a tuple as argument, applies forward to the returned element.
Version (3), which takes a const tuple as argument, returns a const reference to the element.
get can also be used on tuple-like objects like pair and array (see pair's and array's specializations).
Notice that get uses a template parameter, I, to determine which element to be gotten. Template parameters must be constexpr (compile-time const values).
Template parameters
- I
- Position of an element in the tuple, with 0 as the position of the first element.
size_t is an unsigned integral type. - Types
- Types of the elements in the tuple (generally obtained implicitly from tpl).
Function parameters
- tpl
- A tuple object with more than I elements.
Return value
A reference to the element at the specified position in the tuple.tuple_element< I, tuple<Types...> >::type is the type of the Ith element in the tuple.
Example
|
|
Output:
mytuple contains: 20 and a |
See also
- tie
- Tie arguments to tuple elements (function template)
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Spotted an error? contact us