std::calloc

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实用工具库
类型的支持 (basic types, RTTI, type traits)
动态内存管理
错误处理
程序实用工具
可变参数函数
日期和时间
函数对象
initializer_list(C++11)
bitset
hash(C++11)
关系运算符
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
双和元组
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
掉期,远期和移动
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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)
 
动态内存管理
低级别的内存管理
分配器
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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)
未初始化的存储空间
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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
智能指针
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(过时了)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
垃圾收集的支持
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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)
杂项
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Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
C库
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C Library
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malloc
calloc
 
Defined in header <cstdlib>
void* calloc( std::size_t num, std::size_t size );
num对象的大小size和零初始化的数组分配内存.
Original:
Allocates memory for an array of num objects of size size and zero-initializes it.
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如果分配成功,则返回一个指针到最低的(第一个)字节分配的内存块,适当的任何对象类型相一致.
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是零​​,其行为是实现定义的(空指针可能会被退回,可能会被退回,可能无法用于访问存储或一些非空指针)
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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目录

[编辑] 参数

num -
数目的对象
Original:
number of objects
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size -
每个对象的大小
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size of each object
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[编辑] 返回值

新分配的内存或NULL开始的指针,如果发生了错误。指针必须被释放free().
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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[编辑] 注释

由于对齐的要求,分配的字节数不一定等于num*size
Original:
Due to the alignment requirements, the number of allocated bytes is not necessarily equal to num*size.
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[编辑] 为例

[编辑] 另请参阅

C documentation for calloc