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Accesses the static type of the members of a pair object as if it was a tuple.
These class specializations simply provide a member called type, which aliases either T1 or T2, as if defined as:
See tuple_element for more information.
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>
<utility>
classes
functions
types
-
piecewise_construct_tC++11
-
constants
-
piecewise_constructC++11
-
namespaces
pair
- pair::pair
member functions
- pair::operator=
-
pair::swapC++11
non-member overloads
-
get (pair)C++11
- relational operators (pair)
-
swap (pair)C++11
-
non-member specializations
-
tuple_element<pair>C++11
-
tuple_size<pair>C++11
-
class template specialization
<utility>
std::tuple_element<pair>
| unspecialized | template <size_t I, class Tpl> class tuple_element; |
|---|---|
| access first | template <class T1, class T2> struct tuple_element <0, pair<T1,T2>>; |
| access second | template <class T1, class T2> struct tuple_element <1, pair<T1,T2>>; |
Tuple element type for pair
These class specializations simply provide a member called type, which aliases either T1 or T2, as if defined as:
|
|
See tuple_element for more information.
Template parameters
- I
- Order number of the element within the pair (zero-based).
This is0to access the type of member first and1to access the type of member second.
If instantiated with any other values, the program is ill-formed.
size_t is an unsigned integral type. - Tpl
- Tuple-like type. For these specializations:
pair<T1,T2>. - T1, T2
- Type of the elements in the pair.
Aliased as member type.
Member types
| member type | definition |
|---|---|
| type | T1 if I is 0, or T2 id I is 1. |
See also
- tuple_element
- Tuple element type (class template)
- tuple_size<pair>
- Tuple traits for pair (class template specialization)
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Spotted an error? contact us