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C
C++
算法 | Algorithm
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输入/输出 | Input/output
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应用 | Utilities
assert
C Date and time utilities
C memory management library
C numeric limits interface
CLOCKS_PER_SEC
Date and time utilities
Dynamic memory management
errno
Error handling
Error numbers
EXIT_FAILURE
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Fixed width integer types
FLT_EVAL_METHOD
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Function objects
Low level memory management
NULL
offsetof
operators (delete[])
operators (new[])
operators (std::bitset)
operators (std::bitset)
operators (std::bitset)
operators (std::chrono::duration)
operators (std::chrono::duration)
operators (std::error_condition)
operators (std::function)
operators (std::optional)
operators (std::pair)
operators (std::time_point)
operators (std::time_point)
operators (std::tuple)
operators (std::unique_ptr)
operators (std::variant)
Program support utilities
setjmp
SIGABRT
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SIGSEGV
SIGTERM
SIG_DFL
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std::abort
std::addressof
std::add_const
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std::add_lvalue_reference
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std::add_rvalue_reference
std::add_volatile
std::align
std::aligned_alloc
std::aligned_storage
std::aligned_union
std::alignment_of
std::align_val_t
std::allocate_shared
std::allocator_arg
std::allocator_arg_t
std::any
std::any::any
std::any::emplace
std::any::has_value
std::any::reset
std::any::swap
std::any::type
std::any_cast
std::apply
std::asctime
std::as_const
std::atexit
std::atomic_...<std::shared_ptr>
std::at_quick_exit
std::auto_ptr
std::auto_ptr::auto_ptr
std::auto_ptr::get
std::auto_ptr::operator auto_ptr<Y>
std::auto_ptr::operator->
std::auto_ptr::operators
std::auto_ptr::release
std::auto_ptr::reset
std::bad_alloc
std::bad_any_cast
std::bad_array_new_length
std::bad_array_new_length::bad_array_new_length
std::bad_cast
std::bad_cast::bad_cast
std::bad_exception
std::bad_exception::bad_exception
std::bad_exception::what
std::bad_function_call
std::bad_optional_access
std::bad_typeid
std::bad_typeid::bad_typeid
std::bad_variant_access
std::bad_weak_ptr
std::bad_weak_ptr::bad_weak_ptr
std::begin(std::initializer_list)
std::binary_function
std::binary_negate
std::bind
std::bind1st
std::bind2nd
std::binder1st
std::binder2nd
std::bitset
std::bitset::all
std::bitset::any
std::bitset::bitset
std::bitset::count
std::bitset::flip
std::bitset::none
std::bitset::operators
std::bitset::operators
std::bitset::operator[]
std::bitset::reference
std::bitset::reset
std::bitset::set
std::bitset::size
std::bitset::test
std::bitset::to_string
std::bitset::to_ullong
std::bitset::to_ulong
std::bit_and
std::bit_and<void>
std::bit_not
std::bit_not<void>
std::bit_or
std::bit_or<void>
std::bit_xor
std::bit_xor<void>
std::boyer_moore_horspool_searcher
std::boyer_moore_searcher
std::byte
std::calloc
std::chars_format
std::chrono::abs(std::chrono::duration)
std::chrono::ceil(std::chrono::duration)
std::chrono::ceil(std::chrono::time_point)
std::chrono::duration
std::chrono::duration::count
std::chrono::duration::duration
std::chrono::duration::max
std::chrono::duration::min
std::chrono::duration::operator-
std::chrono::duration::operator--
std::chrono::duration::operators
std::chrono::duration::operators (%=)
std::chrono::duration::operators (unary)
std::chrono::duration::zero
std::chrono::duration_cast
std::chrono::duration_values
std::chrono::duration_values::max
std::chrono::duration_values::min
std::chrono::duration_values::zero
std::chrono::floor(std::chrono::duration)
std::chrono::floor(std::chrono::time_point)
std::chrono::high_resolution_clock
std::chrono::high_resolution_clock::now
std::chrono::round(std::chrono::duration)
std::chrono::round(std::chrono::time_point)
std::chrono::steady_clock
std::chrono::steady_clock::now
std::chrono::system_clock
std::chrono::system_clock::from_time_t
std::chrono::system_clock::now
std::chrono::system_clock::to_time_t
std::chrono::time_point
std::chrono::time_point::max
std::chrono::time_point::min
std::chrono::time_point::operators (operator-)
std::chrono::time_point::time_point
std::chrono::time_point::time_since_epoch
std::chrono::time_point_cast
std::chrono::treat_as_floating_point
std::clock
std::clock_t
std::common_type
std::common_type(std::chrono::duration)
std::common_type(std::chrono::time_point)
std::conditional
std::conjunction
std::const_mem_fun1_ref_t
std::const_mem_fun1_t
std::const_mem_fun_ref_t
std::const_mem_fun_t
std::const_pointer_cast
std::cref
std::ctime
std::current_exception
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std::default_delete
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std::error_code::value
std::error_condition
std::error_condition::assign
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std::exception
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std::exchange
std::exit
std::extent
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std::free
std::from_chars
std::function
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std::function::operator bool
std::function::swap
std::function::target
std::function::target_type
std::generic_category
std::get
std::get(std::pair)
std::get(std::tuple)
std::getenv
std::get_deleter
std::get_if
std::get_new_handler
std::get_pointer_safety
std::get_temporary_buffer
std::get_terminate
std::get_unexpected
std::gmtime
std::greater
std::greater<void>
std::greater_equal
std::greater_equal<void>
std::hash
std::hash
std::hash <std::optional>
std::hash <std::unique_ptr>
std::hash <std::variant>
std::hash(std::shared_ptr)
std::hash::hash
std::hash<std::error_code>
std::hash<std::error_condition>
std::hash<std::type_index>
std::has_unique_object_representations
std::has_virtual_destructor
std::holds_alternative
std::ignore
std::initializer_list
std::initializer_list::begin
std::initializer_list::end
std::initializer_list::initializer_list
std::initializer_list::size
std::integer_sequence
std::integral_constant
std::invalid_argument
std::invoke
std::invoke_result
std::in_place
std::in_place_index
std::in_place_index_t
std::in_place_t
std::in_place_t
std::in_place_type
std::in_place_type_t
std::is_abstract
std::is_aggregate
std::is_arithmetic
std::is_array
std::is_assignable
std::is_base_of
std::is_bind_expression
std::is_class
std::is_compound
std::is_const
std::is_constructible
std::is_convertible
std::is_copy_assignable
std::is_copy_constructible
std::is_default_constructible
std::is_destructible
std::is_empty
std::is_enum
std::is_error_code_enum
std::is_error_code_enum<std::future_errc>
std::is_error_condition_enum
std::is_error_condition_enum<std::errc>
std::is_final
std::is_floating_point
std::is_function
std::is_fundamental
std::is_integral
std::is_invocable
std::is_invocable_r
std::is_literal_type
std::is_lvalue_reference
std::is_member_function_pointer
std::is_member_object_pointer
std::is_member_pointer
std::is_move_assignable
std::is_move_constructible
std::is_nothrow_assignable
std::is_nothrow_constructible
std::is_nothrow_copy_assignable
std::is_nothrow_copy_constructible
std::is_nothrow_default_constructible
std::is_nothrow_destructible
std::is_nothrow_invocable
std::is_nothrow_invocable_r
std::is_nothrow_move_assignable
std::is_nothrow_move_constructible
std::is_nothrow_swappable
std::is_nothrow_swappable_with
std::is_null_pointer
std::is_object
std::is_placeholder
std::is_pod
std::is_pointer
std::is_polymorphic
std::is_reference
std::is_rvalue_reference
std::is_same
std::is_scalar
std::is_signed
std::is_standard_layout
std::is_swappable
std::is_swappable_with
std::is_trivial
std::is_trivially_assignable
std::is_trivially_constructible
std::is_trivially_copyable
std::is_trivially_copy_assignable
std::is_trivially_copy_constructible
std::is_trivially_default_constructible
std::is_trivially_destructible
std::is_trivially_move_assignable
std::is_trivially_move_constructible
std::is_union
std::is_unsigned
std::is_void
std::is_volatile
std::jmp_buf
std::launder
std::length_error
std::less
std::less<void>
std::less_equal
std::less_equal<void>
std::literals::chrono_literals::operator""h
std::literals::chrono_literals::operator""min
std::literals::chrono_literals::operator""ms
std::literals::chrono_literals::operator""ns
std::literals::chrono_literals::operator""s
std::literals::chrono_literals::operator""us
std::localtime
std::logical_and
std::logical_and<void>
std::logical_not
std::logical_not<void>
std::logical_or
std::logical_or<void>
std::logic_error
std::longjmp
std::make_any
std::make_error_code(std::errc)
std::make_error_condition(std::errc)
std::make_exception_ptr
std::make_from_tuple
std::make_optional
std::make_pair
std::make_shared
std::make_signed
std::make_tuple
std::make_unique
std::make_unsigned
std::malloc
std::max_align_t
std::mem_fn
std::mem_fun
std::mem_fun1_ref_t
std::mem_fun1_t
std::mem_fun_ref
std::mem_fun_ref_t
std::mem_fun_t
std::minus
std::minus<void>
std::mktime
std::modulus
std::modulus<void>
std::monostate
std::move
std::move_if_noexcept
std::multiplies
std::multiplies<void>
std::negate
std::negate<void>
std::negation
std::nested_exception
std::nested_exception::nested_exception
std::nested_exception::nested_ptr
std::nested_exception::rethrow_nested
std::new_handler
std::not1
std::not2
std::nothrow
std::nothrow_t
std::not_equal_to
std::not_equal_to<void>
std::not_fn
std::nullopt
std::nullopt_t
std::nullptr_t
std::numeric_limits
std::numeric_limits::denorm_min
std::numeric_limits::digits
std::numeric_limits::digits10
std::numeric_limits::epsilon
std::numeric_limits::has_denorm
std::numeric_limits::has_denorm_loss
std::numeric_limits::has_infinity
std::numeric_limits::has_quiet_NaN
std::numeric_limits::has_signaling_NaN
std::numeric_limits::infinity
std::numeric_limits::is_bounded
std::numeric_limits::is_exact
std::numeric_limits::is_iec559
std::numeric_limits::is_integer
std::numeric_limits::is_modulo
std::numeric_limits::is_signed
std::numeric_limits::is_specialized
std::numeric_limits::lowest
std::numeric_limits::max
std::numeric_limits::max_digits10
std::numeric_limits::max_exponent
std::numeric_limits::max_exponent10
std::numeric_limits::min
std::numeric_limits::min_exponent
std::numeric_limits::min_exponent10
std::numeric_limits::quiet_NaN
std::numeric_limits::radix
std::numeric_limits::round_error
std::numeric_limits::round_style
std::numeric_limits::signaling_NaN
std::numeric_limits::tinyness_before
std::numeric_limits::traps
std::operator<<(std::error_code)
std::operators (std::error_code)
std::optional
std::optional::emplace
std::optional::has_value
std::optional::operator*
std::optional::operators
std::optional::operators
std::optional::optional
std::optional::reset
std::optional::swap
std::optional::value
std::optional::value_or
std::out_of_range
std::overflow_error
std::owner_less
std::owner_less
std::pair
std::pair::swap
std::piecewise_construct
std::piecewise_construct_t
std::placeholders::_1
std::placeholders::_2
std::placeholders::_N
std::plus
std::plus<void>
std::pmr::get_default_resource
std::pmr::new_delete_resource
std::pmr::null_memory_resource
std::pmr::pool_options
std::pmr::set_default_resource
std::pointer_safety
std::pointer_to_binary_function
std::pointer_to_unary_function
std::pointer_traits
std::ptrdiff_t
std::ptr_fun
std::quick_exit
std::raise
std::range_error
std::rank
std::rbegin(std::initializer_list)
std::realloc
std::ref
std::reference_wrapper
std::reference_wrapper::get
std::reference_wrapper::operator T&
std::reference_wrapper::reference_wrapper
std::reinterpret_pointer_cast
std::rel_ops::operators
std::remove_all_extents
std::remove_const
std::remove_cv
std::remove_extent
std::remove_pointer
std::remove_reference
std::remove_volatile
std::rend(std::initializer_list)
std::result_of
std::rethrow_exception
std::rethrow_if_nested
std::return_temporary_buffer
std::runtime_error
std::set_new_handler
std::set_terminate
std::set_unexpected
std::shared_ptr
std::shared_ptr::get
std::shared_ptr::operator bool
std::shared_ptr::operator->
std::shared_ptr::operator<<
std::shared_ptr::operators
std::shared_ptr::operators (>=)
std::shared_ptr::operator[]
std::shared_ptr::owner_before
std::shared_ptr::reset
std::shared_ptr::shared_ptr
std::shared_ptr::swap
std::shared_ptr::unique
std::shared_ptr::use_count
std::signal
std::sig_atomic_t
std::size_t
std::static_pointer_cast
std::strftime
std::swap(std::any)
std::swap(std::function)
std::swap(std::optional)
std::swap(std::pair)
std::swap(std::shared_ptr)
std::swap(std::tuple)
std::swap(std::unique_ptr)
std::swap(std::variant)
std::swap(std::weak_ptr)
std::system
std::system_category
std::system_error
std::system_error::code
std::system_error::system_error
std::system_error::what
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std::throw_with_nested
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std::time
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std::tx_exception
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std::pair::pair

STD：：对：成对

​(1)​
pair((until C++11)
constexpr pair((since C++11) (until C++17)
/*EXPLICIT*/ constexpr pair((since C++17)
​(2)​
pair( const T1& x, const T2& y (until C++14)
constexpr pair( const T1& x, const T2& y (since C++14) (until C++17)
/*EXPLICIT*/ constexpr pair( const T1& x, const T2& y (since C++17)
​(3)​
template< class U1, class U2 > pair( U1&& x, U2&& y (since C++11) (until C++14)
template< class U1, class U2 > constexpr pair( U1&& x, U2&& y (since C++14) (until C++17)
template< class U1, class U2 > /*EXPLICIT*/ constexpr pair( U1&& x, U2&& y (since C++17)
​(4)​
template< class U1, class U2 > pair( const pair<U1, U2>& p (until C++14)
template< class U1, class U2 > constexpr pair( const pair<U1, U2>& p (since C++14) (until C++17)
template< class U1, class U2 > /*EXPLICIT*/ constexpr pair( const pair<U1, U2>& p (since C++17)
​(5)​
template< class U1, class U2 > pair( pair<U1, U2>&& p (since C++11) (until C++14)
template< class U1, class U2 > constexpr pair( pair<U1, U2>&& p (since C++14) (until C++17)
template< class U1, class U2 > /*EXPLICIT*/ constexpr pair( pair<U1, U2>&& p (since C++17)
template< class... Args1, class... Args2 > pair( std::piecewise_construct_t, std::tuple<Args1...> first_args, std::tuple<Args2...> second_args (6)(since C++11)
pair( const pair& p ) = default;(7)​
pair( pair&& p ) = default;(8)(since C++11)

构造一个新的一对。

1%29默认构造函数。值-初始化对的两个元素，first和second...

This constructor participates in overload resolution if and only if std::is_default_constructible_v and std::is_default_constructible_v are both true. This constructor is explicit if and only if either first_type or second_type is not implicitly default-constructible.(since C++17)

  • 此构造函数参与过载解析的当且仅当std::is_default_constructible_v<first_type>和std::is_default_constructible_v<second_type>都是true...

  • 此构造函数是explicit当且仅当first_type或second_type不可隐式默认-可构造。

%28自C++17%29

2%29初始化first带着x和second带着y...

This constructor participates in overload resolution if and only if std::is_copy_constructible_v and std::is_copy_constructible_v are both true. This constructor is explicit if and only if std::is_convertible_v is false or std::is_convertible_v is false.(since C++17)

  • 此构造函数参与过载解析的当且仅当std::is_copy_constructible_v<first_type>和std::is_copy_constructible_v<second_type>都是true...

  • 此构造函数是explicit当且仅当std::is_convertible_v<const first_type&, first_type>是false或std::is_convertible_v<const second_type&, second_type>是false...

%28自C++17%29

3%29初始化first带着std::forward<U1>(x)和second带着std::forward<U2>(y)...

This constructor participates in overload resolution only if U1 is implicitly convertible to first_type and U2 is implicitly convertible to second_type.(until C++17)
This constructor participates in overload resolution if and only if std::is_constructible_v<first_type, U1&&> and std::is_constructible_v<second_type, U2&&> are both true. This constructor is explicit if and only if std::is_convertible_v<U1&&, first_type> is false or std::is_convertible_v<U2&&, second_type> is false.(since C++17)

  • 只有在下列情况下，此构造函数才参与重载解析。U1隐式可转换为first_type和U2隐式可转换为second_type...%28直到C++17%29

  • 此构造函数参与过载解析的当且仅当std::is_constructible_v<first_type, U1&&>和std::is_constructible_v<second_type, U2&&>都是true...

  • 此构造函数是explicit当且仅当std::is_convertible_v<U1&&, first_type>是false或std::is_convertible_v<U2&&, second_type>是false...

%28自C++17%29

4%29初始化first带着p.first和second带着p.second...

This constructor participates in overload resolution if and only if std::is_constructible_v and std::is_constructible_v are both true. This constructor is explicit if and only if std::is_convertible_v is false or std::is_convertible_v is false.(since C++17)

  • 此构造函数参与过载解析的当且仅当std::is_constructible_v<first_type, const U1&>和std::is_constructible_v<second_type, const U2&>都是true...

  • 此构造函数是explicit当且仅当std::is_convertible_v<const U1&, first_type>是false或std::is_convertible_v<const U2&, second_type>是false...

%28自C++17%29

5%29初始化first带着std::forward<U1>(p.first)和second带着std::forward<U2>(p.second)...

This constructor participates in overload resolution if and only if std::is_constructible_v and std::is_constructible_v are both true. This constructor is explicit if and only if std::is_convertible_v is false or std::is_convertible_v is false.(since C++17)

  • 此构造函数参与过载解析的当且仅当std::is_constructible_v<first_type, U1&&>和std::is_constructible_v<second_type, U2&&>都是true...

  • 此构造函数是explicit当且仅当std::is_convertible_v<U1&&, first_type>是false或std::is_convertible_v<U2&&, second_type>是false...

%28自C++17%29

6%29转发first_args的构造函数first的元素second_args的构造函数second这是唯一可以用来创建一对不可复制的不可移动类型的非默认构造函数。

7%29复制构造函数是默认的，并且是constexpr如果两个元素的复制都满足对conexpr函数的要求。

8%29移动构造函数是默认的，并且是constexpr如果两个元素的运动满足对常数函数的要求。

参数

x-value to initialize the first element of this pair
y-value to initialize the second element of this pair
p-pair of values used to initialize both elements of this pair
first_args-tuple of constructor arguments to initialize the first element of this pair
second_args-tuple of constructor arguments to initialize the second element of this pair

例外

不引发异常，除非指定的操作之一为%28例如。元素%29抛出的构造函数。

例

二次

#include <utility>
#include <string>
#include <complex>
#include <tuple>
#include <iostream>
 
int main()
{
    std::pair<int, float> p1;
    std::cout << "Value-initialized: "
              << p1.first << ", " << p1.second << '\n';
 
    std::pair<int, double> p2(42, 0.123
    std::cout << "Initialized with two values: "
              << p2.first << ", " << p2.second << '\n';
 
    std::pair<char, int> p4(p2
    std::cout << "Implicitly converted: "
              << p4.first << ", " << p4.second << '\n';
 
    std::pair<std::complex<double>, std::string> p6(
                    std::piecewise_construct, 
                    std::forward_as_tuple(0.123, 7.7),
                    std::forward_as_tuple(10, 'a')
    std::cout << "Piecewise constructed: "
              << p6.first << ", " << p6.second << '\n';
}

二次

产出：

二次

Value-initialized: 0, 0
Initialized with two values: 42, 0.123
Implicitly converted: *, 0
Piecewise constructed: (0.123,7.7), aaaaaaaaaa

二次

另见

make_paircreates a pair object of type, defined by the argument types (function template)

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