class guy
{
public:
foo(int _a)
: a(_a)
{
}
get() //How to write that function so main() will input like shown below?
private:
int a;
}
int main()
{
guy(1553);
std::cout << guy.get(a); //Note it's not geta(), it's get(a), should work for any get(variable_name)
return 0;
}
Desired input:
Quote:1553
Please point my english mistakes everytime you can.
Doesn't a generic get() method defeat the purpose of making members private? If I want to change the internal implementation of my class in the future, code that uses get() would break, even if I leave my public interface unchanged.
Thanks for the answers, but I do have reasons. The get() is just an example so you know what I want, so I don't have to explain the entire reason. If I can manage to make it work, I can also:
1. Simplify the parameters call when many variables have default values. EG: Being able to call: bullet(speed=4) instead of bullet(0,0,4), when the middle 2 variables are, for exemple, it's position and their defaults are 0.
2. Be able to make a sort function to my container that sorts it's contained objects from one of it's variables, example:
container<bullet> bullets(bullet(0,0,3), bullet(20,1,4), (4,3,1)); bullets.sort(speed,1); //sort by speed asc bullets.sort(x,0); //sort by x desc
3. Be able tell a function what object to create. Example:
class sweetiesFabric { blabla }; class chokobunny { blabla }; class goodcake { blabla }; sweeties_fabric_obj.create(chokobunny); sweeties_fabric_obj.create(goodcake);
So I tell the fabric both to create a chokobunny object and a goodcake object. I suppose it can be done with a switch function, but then the function would have to be updated for every new class created and I suppose that goes against the good coding rules.
...
And, also, the get() function proposed won't violate the private as it is supposed to return just a copy of the variables.
Please point my english mistakes everytime you can.
C++ doesn't work like that. You can build things that emulate that, but it will be long and painful and at the end it may be no cleaner than the alternative.
Quote:Original post by WindScar But why it doesn't? Mysql for example got "sort obj by var ASC" and is great, so I don't se reasons for ommiting that possibility.
Speed. C++ is build for speed. Reflection systems always require some kind of class metadata and have an effect on performance.
