std::memset

 

C++

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コンセプト

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正規表現ライブラリ (C++11)

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スレッドのサポートライブラリ (C++11)

 

文字列ライブラリ

NULLで終端された文字列

バイト文字列

マルチバイト文字列

ワイド文字列

クラス

basic_string

char_traits

 

NULL終端バイト文字列

機能します Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
文字操作 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
数値形式への変換 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
文字列操作 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
文字列の検査 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
メモリ操作 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
その他 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* memset( void* dest, int ch, std::size_t count );

chに値を変換してunsigned charcountが指すオブジェクトの最初のdest文字のそれぞれにそれをコピーします。オブジェクト（例えば、スカラー、配列、またはC互換の構造体）-自明コピー可能でない場合、動作は未定義です。 countはdestが指すオブジェクトのサイズよりも大きい場合、動作は未定義です.

Original:

Converts the value ch to unsigned char and copies it into each of the first count characters of the object pointed to by dest. If the object is not trivially-copyable (e.g., scalar, array, or a C-compatible struct), the behavior is undefined. If count is greater than the size of the object pointed to by dest, the behavior is undefined.

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

パラメータ

dest	-	埋めるためのオブジェクトへのポインタ Original: pointer to the object to fill The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ch	-	バイトを埋める Original: fill byte The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	埋めるためにバイト数 Original: number of bytes to fill The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

値を返します

dest

例

このコードを実行します

#include <iostream>
#include <cstring>
 
int main()
{
    int a[20];
    std::memset(a, 0, sizeof(a));
    std::cout << "a[0] = " << a[0] << '\n';
}

出力:

a[0] = 0

参照

memcpy	別のバッファにコピーします Original: copies 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. (関数)
fill_n	要素の数に値を代入します Original: assigns a value to a number of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数テンプレート)
is_trivially_copyable (C++11)	checks if a type is trivially copyable (クラステンプレート)
C documentation for memset