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Consider the following function:
void f(...);
And the following structure:
template <class T>
struct s;
template <class R, class...A>
struct s<R(A...)>
{
//...
};
How exactly does s<decltype(f)> get treated, considering its variadic argument type?
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What does this syntax mean?
ForExample<Something>();
Can someone explain with a few examples how and what for it can be used?
This code could be a call of the template function or instantiation of temporary class object.
For example, function is defined as:
template <typename T>
void ForExample(){
// Do something
}
This function can be called as:
ForExample<int>();
In your case type Something can be any type (int, double, string, float ...)
Or we can define template class:
template <typename T>
class ForExample {
// something
};
Temporary object can be created as:
ForExample<int>();
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I find this question tricky. What do u ppl think?
template <typename T> class myTemplate
{
public:
T val;
...
};
void myFunction()
{
MyTemplate<int> a;
MyTemplate<double> b;
}
You are instantiating the template twice with two different template parameters, so it'll create two class instances.
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code is
struct {
protected:
static int labelCounter;
};
protected members can be assigned in methods that belong to the class, or any derived class.
Your static member can be initialized normally, but you have to give a name to the struct:
struct MyStruct { protected: static int labelCounter; };
// .cpp:
int MyStruct::labelCounter = 12;
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I'm creating class that has a templated object (Item<T>) as a member, basically like this:
class myClass
{
int other_int;
public:
int member_function();
vector<Item<T>> vec;
};
Currently, I have Item<string>, but I need to be able to use it with non string objects. Is there a way to do this without templating myClass (which would obviously be a lot of work for a complicated class)?
If your class will only use Item< string>, you may try:
class myClass
{
int other_int;
public:
int member_function();
vector<Item<string>> vec;
};
But if you want any other type of Item in the vector, the answer is No, there is no magic solutions.
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i have to create an array of objects but i also have a parameterized constructor in my class which does some initialization to the attributes of class.
How to do this in c++?
With a "normal" initialization list?
Example:
struct S
{
S(int, const std::string&) {} // Just a dummy constructor
};
S array_of_s[2] = {
S(123, "foo"),
S(456, "bar")
};