basic_string::copy
Copies at most a specified number of characters from an indexed position in a source string to a target character array.
This method is potentially unsafe, as it relies on the caller to check that the passed values are correct. Consider using basic_string::_Copy_s instead.
size_type copy(
value_type* _Ptr,
size_type _Count,
size_type _Off = 0
) const;
Parameters
_Ptr
The target character array to which the elements are to be copied._ Count
The number of characters to be copied, at most, from the source string._Off
The beginning position in the source string from which copies are to be made.
Return Value
The number of characters actually copied.
Remarks
A null character is not appended to the end of the copy.
Example
// basic_string_copy.cpp
// compile with: /EHsc /W3
#include <string>
#include <iostream>
int main( )
{
using namespace std;
string str1 ( "Hello World" );
basic_string <char>::iterator str_Iter;
char array1 [ 20 ] = { 0 };
char array2 [ 10 ] = { 0 };
basic_string <char>:: pointer array1Ptr = array1;
basic_string <char>:: value_type *array2Ptr = array2;
cout << "The original string str1 is: ";
for ( str_Iter = str1.begin( ); str_Iter != str1.end( ); str_Iter++ )
cout << *str_Iter;
cout << endl;
basic_string <char>:: size_type nArray1;
// Note: string::copy is potentially unsafe, consider
// using string::_Copy_s instead.
nArray1 = str1.copy ( array1Ptr , 12 ); // C4996
cout << "The number of copied characters in array1 is: "
<< nArray1 << endl;
cout << "The copied characters array1 is: " << array1 << endl;
basic_string <char>:: size_type nArray2;
// Note: string::copy is potentially unsafe, consider
// using string::_Copy_s instead.
nArray2 = str1.copy ( array2Ptr , 5 , 6 ); // C4996
cout << "The number of copied characters in array2 is: "
<< nArray2 << endl;
cout << "The copied characters array2 is: " << array2Ptr << endl;
}
The original string str1 is: Hello World
The number of copied characters in array1 is: 11
The copied characters array1 is: Hello World
The number of copied characters in array2 is: 5
The copied characters array2 is: World
Requirements
Header: <string>
Namespace: std