Questions tagged [member-initialization]
121 questions
2
votes
4 answers
Assignment operation in member initializer lists
I have the following Stack class.
class Stack{
public:
int size;
int* x;
Stack() : size(10), x(new int[10]) {}
Stack(const Stack& s) : x(new int[size=s.size]) {}
};
Notice the assignment in the copy constructor. The code works,…
Patrik Valkovič
- 706
- 7
- 26
2
votes
1 answer
C++: Initialize array of objects with parameters within another class
I'm trying to create a class that will have array of objects of another class as its member. This "lower" class constructor demands a parameter (no default c-tor), and I'm not sure how to do this.
In .hpp
class ProcessingElement : public…
Rorschach
- 734
- 2
- 7
- 22
2
votes
0 answers
Are the use of member functions within initialiser lists good or bad practice?
If I have a class which will initialise a member value in such a way that it is not trivial enough to be performed directly within the initialiser list, what is the correct way of initialising that member variable?
class Rectangle
{
private:
…
user7119460
- 1,451
- 10
- 20
2
votes
1 answer
How the member's initial value like 'contents(ht * wd, c)' works in constructor function in C++ Primer?
I have read the book C++ Primer. In section 7.3.1: there is a constructor of Screen class:
class Screen {
public:
typedef std::string::size_type pos;
Screen() = default;
Screen(pos ht, pos wd, char c): height(ht), width(wd),
…
zhenguoli
- 2,268
- 1
- 14
- 31
2
votes
1 answer
Constant variable initializing working only with member initialization list
Consider the code snippet
class Test{
const int i;
public:
// Test(int x):i(x){} This works
Test(int x){
i=x;
} //this doesn't work
Why does the inline member initialization list work while the normal initialization doesn't work?
user3762146
- 205
- 3
- 13
2
votes
1 answer
Modifying a member initializer list
I have some code which effectively reduces to
#include
class A {
std::vector m_sizes;
public:
A(std::initializer_list const& sizes) : m_sizes(sizes) {}
};
class B {
A m_a;
public:
B(int size_front, int size_back,…
Brett Ryland
- 1,045
- 1
- 9
- 17
2
votes
2 answers
Order of member initialization list
After simplifying my code for many times, I found the following cause the problem.
class B {
public:
B(const int x)
:_x(x) {}
const int _x;
};
class C {
public:
C(const B& b)
: _b(b), _b2(_b._x) {}
B _b2; …
hamster on wheels
- 2,771
- 17
- 50
2
votes
1 answer
Mersenne Twister seed as a member variable
I want to know how to keep a mersenne random number generator as a member variable and use it in the same class.
I wrote the class as below and it works perfectly, but I do not like the that std::mt19937 is initialized. I would like to know whether…
Tharindu Kumara
- 4,398
- 2
- 28
- 46
2
votes
3 answers
How to pass pointer of a class member in a member initialization list?
I have a class named HighWaterDetector:
class HighWaterDetector
{
public:
HighWaterDetector(Device* device);
Device * devicePtr;
Output * output1Ptr;
CloudMsgParser * cloudMsgParserPtr;
Output output1;
NCD2Relay ncd2Relay;
…
Felix
- 51
- 2
- 10
2
votes
2 answers
Nested Class. error: expected parameter declarator - for inner class instance
I started learning about nested classes in C++, I tried a quick code which I pasted here to see how nested classes work. But the compilation end with some errors which I can't figure out.
File: check.cpp
class Outside{
public:
class…
jblixr
- 1,345
- 13
- 34
2
votes
1 answer
What is wrong with this Ember.js handlebars if statement?
Hi i have an ember app with a handlebars if else statement that always shows the if part and never the else
I have read everything i can in the ember documentation here and here
and searched the net countless times:(
The code for my controller and…
tharderer
- 83
- 1
- 5
2
votes
1 answer
Is there a non-repetitive way to allow the programmer to choose between copy and move semantics for member initialization?
I want to be able to initialize each field of a class either using move semantics or copy semantics. The constructors will all use essentially the same code for construction, like this:
LogRecord::LogRecord(const Logger &logger, LogLevel level,…
RPFeltz
- 1,049
- 2
- 12
- 21
2
votes
1 answer
Dealing with hard to avoid large numbers of const members in a C++ class
This is a followup question on my previous question:
Initialize const members using complex function in C++ class
In short, I have a program that has a class Grid that contains the properties of a 3D grid. I would like the properties of this grid…
Chiel
- 6,006
- 2
- 32
- 57
2
votes
1 answer
String Array Expecting Declaration?
I'm hitting the following issue in this simple code:
Public Class BookStoreDatabase
Public publicationArray(0 To 3) As String
publicationArray(0) = "Stories to Scare People With"
End Class
The bit "publicationArray(0) etc" is telling me that a…
Brocktoon
- 63
- 1
- 7
2
votes
1 answer
Clang++ non-static data member initialization error? C++11
I can't seem to figure out what Clang is saying or whether it's right as G++-4.7 seems to compile it fine.
The error comes from trying to initialize std::uniform_int_distribution with curly braces for a non-static member.
The following fails…
norcalli
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