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std::memcpy

提供: cppreference.com
< cpp‎ | string‎ | byte

 
 
ストリングスライブラリ
NULLで終わる文字列
Original:
Null-terminated strings
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バイト文字列
文字列をマルチバイト
ワイド文字列
クラス
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Classes
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basic_string
char_traits
 
NULL終端バイト文字列
機能します
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Functions
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文字操作
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Character manipulation
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数値形式への変換
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Conversions to numeric formats
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文字列操作
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
文字列の検査
Original:
String examination
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メモリ操作
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
その他
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Miscellaneous
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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.

目次

[編集] パラメータ

dest -
コピー先のメモリ位置へのポインタ
Original:
pointer to the memory location to copy to
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src -
からコピーするためのメモリ位置へのポインタ
Original:
pointer to the memory location to copy from
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count -
コピーするバイト数
Original:
number of bytes to copy
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[編集] 値を返します

dest

[編集]

#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

[編集] も参照してください

別のバッファを移動します
Original:
moves one buffer to another
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(関数) [edit]
新しい場所に要素の範囲をコピーします
Original:
copies a range of elements to a new location
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(関数テンプレート) [edit]
コピー下位の順序で要素の範囲
Original:
copies a range of elements in backwards order
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(関数テンプレート) [edit]
checks if a type is trivially copyable
(クラステンプレート) [edit]
C documentation for memcpy