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char_traits::copy

Copies a specified number of characters from one string to another.

This method is potentially unsafe, as it relies on the caller to check that the passed values are correct. Consider using char_traits::_Copy_s instead.

static char_type *copy( 
   char_type* _To,  
   const char_type* _From,  
   size_t _Num  
);

_To

The element at the beginning of the string or character array targeted to receive the copied sequence of characters.

_From

The element at the beginning of the source string or character array to be copied.

_Num

The number of elements to be copied.

The first element copied into the string or character array targeted to receive the copied sequence of characters.

The source and destination character sequences must not overlap.

// char_traits_copy.cpp
// compile with: /EHsc /W3
#include <string>
#include <iostream>

int main( )
{
   using namespace std;

   char_traits<char>::char_type s1[] = "abcd-1234-abcd";
   char_traits<char>::char_type s2[] = "ABCD-1234";
   char_traits<char>::char_type* result1;
   cout << "The source string is: " << s1 << endl;
   cout << "The destination string is: " << s2 << endl;
   // Note: char_traits::copy is potentially unsafe, consider
   // using char_traits::_Copy_s instead.
   result1 = char_traits<char>::copy ( s1 , s2 , 4 );  // C4996
   cout << "The result1 = copy ( s1 , s2 , 4 ) is: "
        << result1 << endl;
}
The source string is: abcd-1234-abcd
The destination string is: ABCD-1234
The result1 = copy ( s1 , s2 , 4 ) is: ABCD-1234-abcd

Header: <string>

Namespace: std

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