Questions tagged [injected-class-name]
13 questions
14
votes
1 answer
Why does having a declaration of a private base class render a type name inaccessible?
I am surprised that in the following example declaring Middle's base class private makes that name unavailable as a type in a subsequent derivation.
class Base {
public:
Base(Base const& b) : i(b.i) {}
int i;
};
class Middle : private Base { …
John Yates
- 1,027
- 1
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- 18
6
votes
2 answers
Can an injected class name be used as a type name in a friend declaration?
Consider this code:
template
class Singleton
{
};
class Logger : public Singleton {
friend class Singleton;
};
It compiles in gcc and clang, but is it valid? [temp.local].1 says:
When it is used with a…
Nikolai
- 3,053
- 3
- 24
- 33
6
votes
1 answer
Why injected-class-name is sometimes not treated as a template name in a class template?
Source
In the following cases, the injected-class-name is treated as a template-name of the class template itself:
it is followed by <
it is used as a template argument that corresponds to a template template parameter
it is the final identifier…
ledonter
- 1,269
- 9
- 27
4
votes
2 answers
What happens when Injected-Class-Name occurs? (C++)
According to https://en.cppreference.com/w/cpp/language/injected-class-name
In a class scope, the name of the current class is treated as if it
were a public member name; this is called injected-class-name. The
point of declaration of the name…
csguy
- 1,354
- 2
- 17
- 37
4
votes
1 answer
Do I need to specify typename in the return type of member function if the function is defined inside the body of the class?
Consider the example below:
template
class SomeClass {
// rest of the definition ...
SomeClass& function1() {
// ...
return *this;
}
SomeClass& function2() {
// ...
return *this;
…
user5818995
2
votes
4 answers
Interchanging class & struct keyword in C++
I was reading about one of the strange C++ feature called Injected class name here.
I tried following simple program
#include
class test
{
int s{3};
public:
int get_s()
{ return s; }
};
int main() {
class test::test…
Destructor
- 14,123
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- 126
1
vote
1 answer
what is difference between Node * next and Node * next?
I was writing implementation of Linked List
in the bellow code we have Node * next; and Node * next;
I think both are doing same as pointing to object of Node class or there is difference between them.
template
class Node{
T…
1
vote
1 answer
Strange styling through injected stylesheets with class "logo-icon" in Chrome
My project is built on Angular 9+. Everything used to work correctly. But today (07.08.2020) chrome(Version 84.0.4147.105 (Official Build) (64-bit)) added some injected stylesheet. My logo-icon got some styles from chrome. But it works correctly…
Anarbek
- 11
- 1
1
vote
2 answers
Private inheritance visibility/access in C++
Why does an interface have a special visibility in a method due to a private inheritance?
Note that a global specifier :: is required in my derived class.
I don't understand why a method inherits some kind of visibility due to private inheritance.…
dmayola
- 502
- 5
- 16
1
vote
2 answers
Difference between adding and omitting template parameter for class name inside constructor
I want to know if there is essentially a difference between:
template
class foo{
foo(){};
};
template
class foo{
foo(){};
};
Both seem to work, but I don't understand the difference between the two. The first one…
AspiringMat
- 2,161
- 2
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- 33
1
vote
1 answer
Lookup of base class name after inheriting constructor
Consider the following code:
struct base {};
struct derived : public base {
using base::base;
base foo() const; // how does name lookup on 'base' here work?
};
Intuitively, it's clear that this code is valid, and it does compile (tested…
HighCommander4
- 50,428
- 24
- 122
- 194
0
votes
1 answer
Curious Mixin with variadic constructor
I have a code snipped including a variadic mixin crtp of some sorts and a few related questions. Do I understand correctly that in the following code, the second constructor is merely passing copies of instances of those classes which were used to…
CD86
- 979
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- 27
0
votes
0 answers
Little strange issue on a simple js
I've got a little problem on a simple script
It applies a className only one time on two.
here is my code. Thanks by advance to all community and, please forgive the poor english of a french guy :-) !
AlexB
- 1