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ArnoAtWork

C++ returned data

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I would like to have two functions with the same name. The difference is that one returns elt and the second returns a const elt. Does the compiler is going to automatically call the good function depending if I will or not modify the elt? Thanks.

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No, the function doesn't know what the returned value will be used for.

A distinction can be made between two similarly named functions if they are called on const or non-const objects

eg


#include <iostream>

struct A {
void test() const {//can only be called on a const object

std::cout << "const version called\n"
}
void test() {
std::cout << "non-const version called\n"
}
};

struct B {
const int& test() const {//return a const reference

return myInt;
}
int& test() {
return myInt;
}
int getValue() const {//have to make const or else can't be called on a cont object - try changing it

return value;
}
B() : value(0) {}
private:
int value;
};

int main() {
A object;
object.test();
const A constObject;
constObject.test();

B b;
b.test() = 5;
const B constB;
//constB.test() = 5;//not allowed won't compile

std::cout << b.getValue() << "\n";
std::cout << constB.getValue() << "\n";
return 0;
};

edit: added constructor to B

[edited by - petewood on March 30, 2004 8:22:01 AM]

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It seems that I''ll have to use a kind of structure closed to proxy classe. In this way, I''ll have to wait a write access to make the copy.

Thanks.

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