Cast parameter with const_cast
void g(char* str)
{
}
void f(const char* str)
{
g(const_cast<char*>(str));
}
int main(int argc, char** argv)
{
char str[100];
f(str);
return (0);
}const_cast char type
#include <iostream>
using std::cout;
using std::endl;
#include <cstring>
#include <cctype>
const char *maximum( const char *first, const char *second )
{
return ( strcmp( first, second ) >= 0 ? first : second );
}
int main()
{
char s1[] = "h";
char s2[] = "g";
char *maxPtr = const_cast< char * >( maximum( s1, s2 ) );
cout << "The larger string is: " << maxPtr << endl;
return 0;
}The larger string is: h
const_cast int value
#include <iostream>
using namespace std;
void sqrval(const int *val)
{
int *p;
// cast away const-ness.
p = const_cast<int *> (val);
*p = *val * *val; // now, modify object through v
}
int main()
{
int x = 10;
cout << "x before call: " << x << endl;
sqrval(&x);
cout << "x after call: " << x << endl;
return 0;
}x before call: 10
x after call: 100
Use const_cast on a const reference
#include <iostream>
using namespace std;
void sqrval(const int &val)
{
const_cast<int &> (val) = val * val;
}
int main()
{
int x = 10;
cout << "x before call: " << x << endl;
sqrval(x);
cout << "x after call: " << x << endl;
return 0;
}x before call: 10
x after call: 100
Use const_cast to cast parameter before passing it into a function
#include <iostream>
using namespace std;
void print (char * str)
{
cout << str << endl;
}
int main () {
const char * c = "sample text";
print ( const_cast<char *> (c) );
return 0;
}
