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Class designed to access the type of the Ith element in a tuple.
It is a simple class with a single member type, tuple_element::type, defined as an alias of the type of the Ith element in a tuple of type T.
The class is itself undefined for the generic type T, but it is specialized for tuple instantiations in the
For
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
-
class template
<tuple>
std::tuple_element
| unspecialized | template <size_t I, class T> class tuple_element; |
|---|---|
| generic cv-specializations | template <size_t I, class T> class tuple_element<const T>;template <size_t I, class T> class tuple_element<volatile T>;template <size_t I, class T> class tuple_element<const volatile T>; |
| tuple specialization | template <size_t I, class... Types> class tuple_element< I, tuple<Types...> >; |
Tuple element type
It is a simple class with a single member type, tuple_element::type, defined as an alias of the type of the Ith element in a tuple of type T.
The class is itself undefined for the generic type T, but it is specialized for tuple instantiations in the
<tuple> header, and for tuple-like types array and pair in their respective headers.For
const and/or volatile-qualified tuples, the class is specialized so that its type member has itself that same qualification.Template parameters
- I
- Order number of the element within the tuple (zero-based).
This shall be lower than the actual number of elements in the tuple.
size_t is an unsigned integral type. - T
- Type for which the type of the tuple element is to be obtained.
This shall be a class for which a specialization of this class exists, such as a tuple, and tuple-like classes array and pair.
Member types
| member type | definition |
|---|---|
| type | The Ith type in the tuple object |
Example
|
|
Output:
mytuple contains: 10 and a |
See also
- tuple
- Tuple (class template)
- tuple_size
- Tuple size traits (class template)
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Spotted an error? contact us