Implicit conversion
suggest changestatic_cast
can perform any implicit conversion. This use of static_cast
can occasionally be useful, such as in the following examples:
- When passing arguments to an ellipsis, the “expected” argument type is not statically known, so no implicit conversion will occur.
const double x = 3.14;
printf("%d\n", static_cast<int>(x)); // prints 3
// printf("%d\n", x); // undefined behaviour; printf is expecting an int here
// alternative:
// const int y = x; printf("%d\n", y);
Without the explicit type conversion, a double
object would be passed to the ellipsis, and undefined behaviour would occur.
- A derived class assignment operator can call a base class assignment operator like so:
struct Base { /* ... */ };
struct Derived : Base {
Derived& operator=(const Derived& other) {
static_cast<Base&>(*this) = other;
// alternative:
// Base& this_base_ref = *this; this_base_ref = other;
}
};
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