Bootstrap 4
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C
C++
算法 | Algorithm
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assert
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std::apply
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std::as_const
std::atexit
std::atomic_...<std::shared_ptr>
std::at_quick_exit
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std::auto_ptr::operator auto_ptr<Y>
std::auto_ptr::operator->
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std::auto_ptr::reset
std::bad_alloc
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std::bitset::to_ullong
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std::bit_and
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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
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std::const_pointer_cast
std::cref
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std::error_code::value
std::error_condition
std::error_condition::assign
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std::error_condition::value
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std::getenv
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std::gmtime
std::greater
std::greater<void>
std::greater_equal
std::greater_equal<void>
std::hash
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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
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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
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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
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std::logical_or
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std::logic_error
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std::make_error_condition(std::errc)
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std::negate
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std::numeric_limits::is_exact
std::numeric_limits::is_iec559
std::numeric_limits::is_integer
std::numeric_limits::is_modulo
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std::numeric_limits::max_exponent10
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std::numeric_limits::quiet_NaN
std::numeric_limits::radix
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std::realloc
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std::remove_all_extents
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std::remove_extent
std::remove_pointer
std::remove_reference
std::remove_volatile
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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
std::terminate
std::terminate_handler
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std::tie
std::time
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std::tx_exception
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std::rank

STD：职级

Defined in header ​​
template< class T > struct rank;​(since C++11)

如果T是数组类型，提供成员常量。value等于数组的维数。对于任何其他类型，value是0。

辅助变量模板

template< class T > inline constexpr std::size_t rank_v = rank::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value staticthe number of dimensions of T or zero (public static member constant)

成员函数

operator std::size_tconverts the object to std::size_t, returns value (public member function)
operator() (C++14)returns value (public member function)

成员类型

TypeDefinition
value_typestd::size_t
typestd::integral_constant<std::size_t, value>

可能的实施

模板<class T>结构等级：公共STD：：整数[医]常数<std：：size[医]t，0>{}；模板<class T>结构秩<T。[]>：公共性病：：整数[医]常数<std：：size[医]T级<T>*值+1>{}；模板<类T，std：：size[医]t N>结构秩<Tn>：公共科技促进发展：：整体[医]常数<std：：size[医]T级<T>*值+1>{}；

*。

例

二次

#include <iostream>
#include <type_traits>
 
int main()
{
    std::cout << std::rank<int[1][2][3]>::value << '\n';
    std::cout << std::rank<int[][2][3][4]>::value << '\n';
    std::cout << std::rank<int>::value << '\n';
}

二次

产出：

二次

3
4
0

二次

另见

is_array (C++11)checks if a type is an array type (class template)
extent (C++11)obtains the size of an array type along a specified dimension (class template)
remove_extent (C++11)removes one extent from the given array type (class template)
remove_all_extents (C++11)removes all extents from the given array type (class template)

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