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ArgumentNullException for nested members


ArgumentNullException for nested members

By : Jongos
Date : November 14 2020, 04:51 PM
I wish this helpful for you No you shouldn't throw ArgumentNullException for this purpose as it is designed specifically to address null references.
code :


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C++ classes and nested members

C++ classes and nested members


By : Basap
Date : March 29 2020, 07:55 AM
I hope this helps you . I'm not sure how to call this. Basically I want to make a class with nested members. , Something like this:
code :
class Plass
{
public:
    Plass(Point *newPoint, Way *newWay)
    {
         moint = newPoint;
         bay = newWay;
         // or instantiate here:
         // moint = new Point();
         // bay = new Way();
         // just don't forget to mention it in destructor
    }
    Point *moint;
    Way *bay;
}
Plass *doxy = new Plass();
doxy->moint->x;
doxy->bay->path->getPath();
Members of a nested namespace

Members of a nested namespace


By : user2145859
Date : March 29 2020, 07:55 AM
hop of those help? Assuming namespace A2 is nested within namespace A1, then A2 is a member of enclosing A1. But members of A2 ( thus types declared within A2 ) are not members of A1. , Consider the following
code :
namespace A1
{
    namespace A2  // A1.A2
    {
        class C2  // full name: A1.A2.C2
        {
            private A1.C1 c1b;   // full name 
            private C1 c1b;      // shortest form. A1 is in scope here
        }
    }

    class C1   // full name: A1.C1
    {
        private A1.A2.C2 c2a;   // full name
        private A2.C2 c2b;      // shortest form. We can omit the A1 prefix but not A2
    }
}
Access members of nested class

Access members of nested class


By : Patrick Faria
Date : March 29 2020, 07:55 AM
this one helps. ,
it either tells me I need an object [...]
code :
class A
{
        class B
        {
        public:
                int x;
        } mB;

public:
        void printX() { std::cout << mB.x; }
};
Kotlin visibility of nested members

Kotlin visibility of nested members


By : Kassius
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have a class with a nested, private class. I have a Builder, standard Java builder pattern, that constructs instances of this class. I don't want anyone outside of my class to be able to see my hidden class. , I see two viable options:
code :
class Example private constructor(builder: Builder) {
    private val doNotExposeThis: SneakyType

    init {
        doNotExposeThis = builder.doNotExposeThis
    }

    internal class SneakyType(x: String)

    class Builder {
        internal lateinit var doNotExposeThis: SneakyType

        fun addFoo(something: String) {
            doNotExposeThis = SneakyType(something)
        }

        fun build(): Example {
            return Example(this)
        }
    }
}
class Example private constructor(private val doNotExposeThis: SneakyType) {
    private class SneakyType(x: String)

    class Builder {
        private lateinit var doNotExposeThis: SneakyType

        fun addFoo(something: String) {
            doNotExposeThis = SneakyType(something)
        }

        fun build(): Example {
            return Example(doNotExposeThis)
        }
    }
}
std::void_t and nested non type members

std::void_t and nested non type members


By : jks
Date : March 29 2020, 07:55 AM
I hope this helps you . I have the following code where I get unexpected result (second static_assert fails): ,
Is there a nicer way to do what I want?
code :
template <auto...>
using value_void_t = void;
template <typename T>
struct is_bananas<T, value_void_t<T::config::num_items>>
   : std::true_type {};
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