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std::calloc

提供: cppreference.com
< cpp‎ | memory‎ | c

 
 
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)
動的なメモリ管理
エラー処理
プログラムユーティリティ
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
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
Original:
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)
 
動的なメモリ管理
低レベルのメモリ管理
アロケータ
Original:
Allocators
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allocator
allocator_traits(C++11)
allocator_arg_t(C++11)
allocator_arg(C++11)
uses_allocator(C++11)
scoped_allocator_adaptor(C++11)
ストレージを初期化されていない
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Uninitialized storage
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uninitialized_copy
uninitialized_copy_n(C++11)
uninitialized_fill
uninitialized_fill_n
raw_storage_iterator
get_temporary_buffer
return_temporary_buffer
スマートポインタ
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(廃止予定)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
ガベージコレクションをサポートしています
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Garbage collection support
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declare_reachable(C++11)
undeclare_reachable(C++11)
declare_no_pointers(C++11)
undeclare_no_pointers(C++11)
pointer_safety(C++11)
get_pointer_safety(C++11)
その他
Original:
Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
Cライブラリ
Original:
C Library
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malloc
calloc
 
Defined in header <cstdlib>
void* calloc( std::size_t num, std::size_t size );
割り当てサイズnumsizeオブジェクトの配列のためのメモリおよびゼロ初期化し、それを.
Original:
Allocates memory for an array of num objects of size size and zero-initializes it.
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割り当てが成功した場合、適当に任意のオブジェクト型に整列された割り当てられたメモリブロックの最下位(最初の)バイトへのポインタを返す.
Original:
If allocation succeeds, returns a pointer to the lowest (first) byte in the allocated memory block that is suitably aligned for any object type.
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sizeがゼロの場合、動作は実装定義(nullポインタが返されることがあります、または一部の非NULLポインタがストレージにアクセスするために使用されない場合があり、その戻される場合があります)
Original:
If size is zero, the behavior is implementation defined (null pointer may be returned, or some non-null pointer may be returned that may not be used to access storage)
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目次

[編集] パラメータ

num -
オブジェクトの数
Original:
number of objects
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size -
各オブジェクトのサイズ
Original:
size of each object
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[編集] 値を返します

エラーが発生した場合、新たに割り当てられたメモリやNULLの先頭を指すポインタ。ポインタはfree()を使って解放する必要があります.
Original:
Pointer to the beginning of newly allocated memory or NULL if error has occurred. The pointer must be deallocated with free().
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[編集] ノート

アラインメントの要件のために、割り当てられたバイト数がnum*sizeとは必ずしも一致しないです.
Original:
Due to the alignment requirements, the number of allocated bytes is not necessarily equal to num*size.
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[編集]

[編集] も参照してください

C documentation for calloc