Questions tagged [member-initialization]
121 questions
0
votes
1 answer
Member initialization syntax in C++ constructors
Why does the following not compile?
class A {
public:
A(int a) : a_{a} {}
private:
int a_;
};
ethelion
- 105
- 6
0
votes
1 answer
cppcheck: member variable not initialized in the constructor
The following code, as far as I can tell, correctly initializes the variables of the derived class B:
#include
struct A {
int i;
};
struct B : A {
int j;
explicit B(A&& a) : A(std::move(a)), j{i} { }
};
int main()
{
A a{3};
B…
francesco
- 7,189
- 7
- 22
- 49
0
votes
1 answer
Why does a Member initialized list for a default constructor in a composite class not call the member object constructor?
The Member initialized list for a default constructor in a composite class does not call the member object constructor.
#include
struct test{
test(){
std::cout << "defualt is called" << std::endl;
}
test(int num){
…
Benjamin Tan
- 3
- 2
0
votes
1 answer
Call different initializer after type checking
I have a generic class, where two of the generics are going to be identical 90% of the time, but on the off chance that they are separate types, I need to perform member initialization a little bit differently.
template
Oren Bell
- 460
- 1
- 5
- 13
0
votes
1 answer
Initialize member in class constructor and pass member down to base class at the same time
I have a main class (MyClass) derived from MyBase. Also I have a Helper class (used by MyClass) derived from HelperBase (used by MyBase). Is there a way to initialize the Helper in the constructor initialization of MyClass and also pass the helper…
Robin Holenweger
- 321
- 3
- 14
0
votes
0 answers
Direct list initialization or direct initialization in member initializer list?
I recently caught up on Member Initializer Lists.
The Cpp-Learning-Site suggests to always prefer direct list initialization over direct initilization.
int a(5);
int b{5}; // preferred
I noticed that both of these can be used in Member…
Raumschifffan
- 360
- 2
- 13
0
votes
1 answer
Is a member initialization list without a value defined?
Say I have :
class Foo
{
public:
int x;
Foo() : x() {}
}
Would it be UB to read x after the constructor has ran? More specifically, what type of initialization is this, zero, direct or default initialization?
I know if instead we'd have:
Foo()…
Hatted Rooster
- 35,759
- 6
- 62
- 122
0
votes
1 answer
Problem while initializing reference variable of class through Member initialization list
code
#include
struct A
{
private:
public:
int &p,q;
A(int &k1,int k2):p(k1),q(k2)
{
}
};
int main()
{
int x=2;
A a1(x,3);
std::cout<<&x<<"\n";
// …
Abhishek Mane
- 619
- 7
- 20
0
votes
0 answers
A choice of constructor arguments in a member initializer list
This question may turn out to be more about CPUs/memory than the C++ language itself.
I have a class B provided below.
class B {
public:
B(int num): num_(num), a(num_){}
private:
int num_;
A a;
};
In the constructor of B, the object a…
mana
- 545
- 4
- 12
0
votes
0 answers
Member Initialization of a constructor in C++
I want to ask you why those two 'Student' constructor commented below don't work.
#include
#include
using namespace std;
class Temp{
public:
void Tempshow(){
cout << "Mother Class"…
Shrew
- 13
- 2
0
votes
2 answers
How to fix of [-Wreorder] & [-Wuninitialized] warrings when initializing using member-initializer list?
In a class that looks somehow like this:
MyClass.h
class MyClass{
public:
MyClass();
int x1;
int x2;
int x3;
int x4;
int x5;
private:
int y1;
int y2;
};
MyClass.cpp
#include "MyClass.h"
int someFunc1(int x1, int…
Bobo Feugo
- 162
- 1
- 10
0
votes
2 answers
Query about member initialization
while I was doing hackerrank c++ exercises I stumbled upon this code in the discussions section:
class BadLengthException : public std::runtime_error
{
public:
BadLengthException(int length) : std::runtime_error{std::to_string(length)}
{…
Aero
- 3
- 2
0
votes
0 answers
class 'Ninja' does not have any field named 'Damage'
Base class:
class Entity {
public:
// friend
// e1 attacker, e2 target
friend void Attack( Entity &e1, Entity &e2 );
// methods set attributes
virtual void setDamage ( int x ) { this -> Damage = x; }
virtual void…
Divizia de Lemn
- 3
- 2
0
votes
2 answers
Implementation file (.cpp) for a class with member initialization
My question must be simple, but I cannot find a right way to split the constructor with initialized members to .h and .cpp (definition and implementation), files.
If, say, I have:
class Class {
public:
Class (int num, float fl ... ) :…
RockOGOlic
- 150
- 1
- 7
0
votes
2 answers
Initializing a member in an inherited class with different value of base class
Lets say I have an Entity class with the variable x and it is defined as 0 in that class.
Well then I make a derived class Player but I want the Player's inherited x by default to be 1 and not 0, so that every Player I create has x be 1 by default.…
Aravash
- 39
- 3