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std::size_t

提供: cppreference.com
< cpp‎ | types

 
 
ユーティリティライブラリ
支援を入力します (basic types, RTTI, type traits)
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可変個引数関数
日付と時刻
関数オブジェクト
initializer_list(C++11)
bitset
hash(C++11)
関係演算子
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
フォワード、スワップ、および移動
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
支援を入力します
基本的なタイプ
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Basic types
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基本的なタイプ
固定幅の整数型 (C++11)
ptrdiff_t
size_t
max_align_t(C++11)
数値の限界
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Numeric limits
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numeric_limits
Cの数値は、インターフェイスを制限します
実行時型情報
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Runtime type information
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型の特徴
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Type traits
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プライマリタイプカテゴリ
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Primary type categories
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is_void(C++11)
is_array(C++11)
is_pointer(C++11)
is_enum(C++11)
is_union(C++11)
is_class(C++11)
is_function(C++11)
is_object(C++11)
is_scalar(C++11)
is_compound(C++11)
is_integral(C++11)
is_floating_point(C++11)
is_fundamental(C++11)
is_arithmetic(C++11)
is_reference(C++11)
is_lvalue_reference(C++11)
is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Typeプロパティ
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Type properties
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is_const(C++11)
is_volatile(C++11)
is_pod(C++11)
is_empty(C++11)
is_polymorphic(C++11)
is_abstract(C++11)
サポートされる操作
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Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible
(C++11)
(C++11)
(C++11)
is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible
(C++11)
(C++11)
(C++11)
is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible
(C++11)
(C++11)
(C++11)
is_move_constructible
is_trivially_move_constructible
is_nothrow_move_constructible
(C++11)
(C++11)
(C++11)
is_assignable
is_trivially_assignable
is_nothrow_assignable
(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable
(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable
(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible
(C++11)
(C++11)
(C++11)
has_virtual_destructor(C++11)
リレーションシップとプロパティクエリ
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
型の変更
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Type modifications
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remove_cv
remove_const
remove_volatile
(C++11)
(C++11)
(C++11)
add_cv
add_const
add_volatile
(C++11)
(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
型変換
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Type transformations
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
形質定数を入力します
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Type trait constants
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integral_constant(C++11)
 
Defined in header <cstddef>
Defined in header <cstdio>
Defined in header <cstring>
Defined in header <ctime>
typedef /*implementation-defined*/ size_t;
std::size_tsizeof演算子とalignof演算子の結果の符号なし整数型である.
Original:
std::size_t is the unsigned integer type of the result of the sizeof operator and the alignof operator.
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[編集] ノート

size_tの任意の型(配列を含む)の理論的に可能なオブジェクトの最大サイズを格納することができます。多くのプラットフォームでは(例外はセグメント化されたアドレッシングを持つシステムである)はstd :: size_tは安全にstd::uintptr_tと同義であり、その場合には、任意の非メンバポインタの値を格納することができます.
Original:
size_t can store the maximum size of a theoretically possible object of any type (including array). On many platforms (an exception are systems with segmented addressing) std::size_t can safely store the value of any non-member pointer, in which case it is synonymous with std::uintptr_t.
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std::size_t一般に配列のインデックスとループカウントのために使用されます。配列のインデックス付けのためにそのようなunsigned intなどの別の型を、使用するプログラムは、例えば上で失敗することがあります64ビットシステムでは、32ビットモジュラー演算に依存している場合、インデックスがUINT_MAX超えたり.
Original:
std::size_t is commonly used for array indexing and loop counting. Programs that use other types, such as unsigned int, for array indexing may fail on, e.g. 64-bit systems when the index exceeds UINT_MAX or if it relies on 32-bit modular arithmetic.
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インデックスを作成する際に、C + +などの容器、std::stringstd::vectorなど、適切なタイプはそのような容器で提供されるメンバのtypedefsize_typeです。これは通常std::size_tの同義語として定義されています.
Original:
When indexing C++ containers, such as std::string, std::vector, etc, the appropriate type is the member typedef size_type provided by such containers. It is usually defined as a synonym for std::size_t.
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[編集]

#include <cstddef>
int main()
{
    const std::size_t N = 100;
    int* a = new int[N];
    for(std::size_t n = 0; n<N; ++n)
        a[n] = n;
    delete[] a;
}


[編集] も参照してください

二つのポインタを減算したときに符号付き整数型が返されます
Original:
signed integer type returned when subtracting two pointers
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(typedefです) [edit]
バイトは、標準レイアウトの種類の先頭から指定されたメンバへのオ​​フセット
Original:
byte offset from the beginning of a standard-layout type to specified member
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(関数マクロ) [edit]