std::memset

Defined in header <cstring>
void* memset( void* dest, int ch, std::size_t count );

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 dest+size+1 points outside the object, the behavior is undefined.

Parameters

dest	-	pointer to the object to fill
ch	-	fill byte
count	-	number of bytes to fill

Return value

dest

Example

run this code

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

Output:

a[0] = 0

See also

Template:cpp/string/byte/dcl list memcpyTemplate:cpp/algorithm/dcl list fill n

is_trivially_copyable (C++11)	checks if a type is trivially copyable (class template)