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My main question is: can I put the generic type before a class definition?
Like, can I do something like this:
generic class Classname (ParameterType parameter)
{
cout << "Hello world";
}
Templates are the way to do generics in C++. You can write it like this:
template<class ItemType> class ClassName
{
public:
ClassName(const ItemType& newdata) : data(newdata) {}
private:
ItemType data;
};
Later on in main:
ClassName<int> data1(1);
ClassName<char> data2('A');
Related
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How to translate this cpp code to golang ?
template<T> class CppTemp {
T a;
T* pa;
T foo(T &t);
};
template<T> T foo2(const T &t)
Go doesn't support templates or generics. There are three things you can do:
use non-empty interfaces where applicable
generate code with go generate
use interface{}:
type GoTemp struct {
a interface{}
}
func (gt *GoTemp) foo(v interface{}) {
// ...
}
func foo2(v interface{}) {
// ...
}
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I have an private property in my class and I want to add some code on its setter, how can I accomplish that?
I might do that using method but I don't want to just to avoid using property.
private:
float damage;
You can replace your plain old data type with a class type to do what you want:
class Damage
{
public:
Damage& operator=(float x) { value = x; /* add code here*/ }
operator float() const { return value; }
private:
float value;
};
Then just replace your float with Damage and you can make it behave how you want.
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I have a function which takes two variables:
call((void**) &var, float);
call((void**) &var, int);
call((void**) &var, string);
Now I want to create a function to call that special function:
function start_call(/*what to put here?*/)
{
call((void**) &var1, float);
call((void**) &var2, int);
call((void**) &var3, string);
//code
}
So, what to put in the "what to put here?" place, in order for the function to accep any variable?
I tried my berst to explain it...
You could use a template:
template <class T> start_call(T in);
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I know there is no specific rule of how to use or declare a string literal, like for example in my class, I want to use "MyName" string literal, and its the only class that will use it, for example,
// CFoo.h
class CFoo
{
public:
CFoo();
~CFoo();
void printString();
}
// CFoo.cpp
CFoo::CFoo()
{
}
CFoo::~CFoo()
{
}
void CFoo::printString()
{
std::cout << "MyName" << std::endl;
}
Now I want that "MyName" will have a descriptive name placeholder, like NameLiter or something like that. Should I use define preprocessor, or declare it as global in cpp as const std::string? Or should I make a private member variable and initialize it in the ctor initializer list?
Thanks!
Making it a private static const char* in CFoo would satisfy your requirements.
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I have to build a videogame with SDL for my end year proyect. However I'm somewhat lost about how and when to use classes.
T tried to include a variable type struct inside a class but I can't manage to do it, maybe Position should be a class instead of a struct? Here's my code:
struct Position{
int x,y;
};
class Object{
private:
Position pos;
Position speed;
int tipe;
public:
Objeto(int,int);
Objeto();
~Objeto(); // DESTROY
};
When I try to do this I get error: 'class Object' has no member named 'x' How can I include the struct in the object?
From your error, I think you are trying to use
Objeto.x
instead of
Objeto.pos.x