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Trying to understand when a name is in the current instantiation


Trying to understand when a name is in the current instantiation

By : Thamwest
Date : September 22 2020, 08:00 PM
will help you There are two types of template code. You have dependent and non dependent code, that is code that depends on a template parameter and code that doesn't. In
code :
int g(){ return r; }
int f(){ return this->r; }


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Class instantiation Syntax - Can't understand it

Class instantiation Syntax - Can't understand it


By : user3635398
Date : March 29 2020, 07:55 AM
wish helps you PHP isn't the only language that supports this. If the constructor takes no parameters, also C++ allows the bypass of parentheses.
Choose whichever you see around the code - i.e. if the company leaves out parentheses for default constructors, you should also leave them out, and vice-versa. Both are legal.
How to understand and fix recursive template instantiation error using boost ublas?

How to understand and fix recursive template instantiation error using boost ublas?


By : Toby Hsu
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Your operator - () function is setting up an infinite template instantiation recursion by invoking itself when doing vec - scalar_v. Although the name of the parameter type is scalar_t, this is just a name and it can match any type, including a scalar_vector.
Thus, the line xbnew = operator - (x, bnew) will cause the instantiation of:
code :
operator - <DVEC, double>()
operator - <DVEC, scalar_vector<double>>()
operator - <DVEC, scalar_vector<scalar_vector<double>>>()
How can I conditionally add in a mixin to the current class on instantiation?

How can I conditionally add in a mixin to the current class on instantiation?


By : user3095301
Date : March 29 2020, 07:55 AM
This might help you
__init__ is only called if __new__ returns an instance of the class. Your on-the-fly class inherits from a mixin, and from Sub's parents, but not from Sub itself. It'll probably work if you set bases = (MixinOne, cls).
Cannot understand reason for comparison between float and object instantiation

Cannot understand reason for comparison between float and object instantiation


By : user3484261
Date : March 29 2020, 07:55 AM
this one helps.
It seems we are comparing a short divided by an int casted to float with a variable declaration, namely tesseract::DoubleParam quality_outline_pc?
What is the current instantiation?

What is the current instantiation?


By : Calle
Date : March 29 2020, 07:55 AM
With these it helps Informally speaking, the phrases "the current instantiation" and "member of the current instantiation" are defined to set up a rule that within the scope of a class template, names of that class and its members are for most syntactic requirements treated like non-dependent names. This makes writing class templates less tedious, requiring fewer typename and template keywords, explicit this-> member access expressions, etc. in some cases.
That cppreference page does define what can and cannot be the current instantiation, in the four bullet points under "Only the following names can refer to the current instantiation". (Though maybe the "only" isn't the best wording.) This list closely parallels the formal definition in the Standard, found at [temp.dep.type]/1.
code :
template <typename X>
class A {
    class B {
        template <typename Y>
        class C {
            // Point #1
            void f();
        };
    };
};

template <typename X> template <typename Y>
void A<X>::B::C<Y>::f() {
    // Point #2
}
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