std::memcpy

 

C++

语言

概念

实用工具库

字符串库

集装箱库

算法库

迭代器库

Numerics的图书馆

输入/输出库

本地化库

正则表达式库 （C++11）

原子操作库 （C++11）

线程的支持库 （C++11）

 

字符串库

null结尾的字符串 Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

字节的字符串

多字节字符串

宽字符串

类 Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

NULL结尾的字节串

功能 Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
字符操作 Original: Character manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
isalnum isalpha islower isupper isdigit isxdigit isblank （C++11）	iscntrl isgraph isspace isprint ispunct tolower toupper
转换为数字格式 Original: Conversions to numeric formats The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
atof atoi atol atoll strtol strtoll	strtoul strtoull strtof strtod strtold
字符串操作 Original: String manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strcpy
strncpy
strcat
strncat
strxfrm
字符串检查 Original: String examination The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strlen strcmp strncmp strcoll strchr strrchr	strspn strcspn strpbrk strstr strtok
内存操作 Original: Memory manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
memchr
memcmp
memset
memcpy
memmove
杂项 Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strerror

 

Defined in header <cstring>
void* memcpy( void* dest, const void* src, std::size_t count );

Copies count bytes from the object pointed to by src to the object pointed to by dest.

If the objects overlap, the behavior is undefined. If the objects are not trivially copyable (e.g. scalars, arrays, C-compatible structs), the behavior is undefined.

。参数。

dest	-	。复制到存储器位置的指针。 Original: pointer to the memory location to copy to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
src	-	。指针指向的内存位置复制。 Original: pointer to the memory location to copy from The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	。要复制的字节数。 Original: number of bytes to copy The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

===。 返回值。=== dest

。为例。

#include <iostream>
#include <cstring>
 
int main()
{
    char source[] = "once upon a midnight dreary...";
    char dest[4];
    std::memcpy(dest, source, sizeof dest);
    for (char c : dest) {
        std::cout << c << '\n';
    }
}

Output:

o
n
c
e

。另请参阅。

memmove	一个缓冲器移动到另一个地方 Original: moves one buffer to another The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
copy copy_if （C++11）	某一范围的元素复制到一个新的位置 Original: copies a range of elements to a new location The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）
copy_backward	份向后为了在一个范围内的元素 Original: copies a range of elements in backwards order The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）
is_trivially_copyable （C++11）	checks if a type is trivially copyable （类模板）
C documentation for memcpy