std::memcpy

 

C++

Язык

Понятия (концепции)

Утилиты

Строки

Контейнеры

Алгоритмы

Итераторы

Работа с числами

Ввод / вывод

Локализация

Регулярные выражения (C++11)

Атомарные примитивы (C++11)

Потоки (C++11)

 

Строки

Нуль-терминальные строки

Однобайтовые строки

Многобайтовые строки

Широкие строки

Классы

basic_string

char_traits

 

Нульзаканчивающихся строк байт

Функции Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Персонаж манипуляции 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
Преобразование в цифровой формат 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
Строками 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
Струнный экспертизы 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
Память манипуляции 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
Разное 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

 

Заголовочный файл <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.

Параметры

dest	-	указатель на ячейку памяти для копирования 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	-	указатель на ячейку памяти для копирования 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	-	количество байт для копирования 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.

Возвращаемое значение

dest

Пример

#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';
    }
}

Вывод:

o
n
c
e

См. также

memmove	перемещает одного буфера в другой 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. (функция)
copy copy_if (C++11)	копирует диапазон элементов (шаблон функции)
copy_backward	копии диапазон элементов в обратном порядке 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. (шаблон функции)
is_trivially_copyable (C++11)	checks if a type is trivially copyable (шаблон класса)
C документация для memcpy