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by: Tanmoy Bhattacharya |
last post by:
Hi,
This is a question about whether I am right that a particular syntactic
sugar is missing in C++.
Let me explain with an example. Let us say I have a class for complex
numbers, and I want people to be able to initialize real numbers (like
an object of type double) from it ... in such a context (or if someone
explicitly casts to double), the imaginary part is to be ignored.
However, I certainly do not want people to be able to ask...
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by: Dave |
last post by:
Hello NG,
Can anybody fathom the purpose of an explicit copy constructor? On page 232
of the Josuttis STL reference, I see a reference to such.
How could you ever need to supress the possibility of an implicit conversion
from type T to type T? Such an implicit conversion could never occur
because you're already of the required type!
Thanks,
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by: spamadress |
last post by:
Hello
I wonder why only constructors can be qualified with explicit to
prevent implicit conversion, but not conversion operators. To me the
following makes perfectly sense:
struct A {
explicit operator int() { return 0;} ;
};
void foo(int) {};
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by: Ken Tough |
last post by:
Seems like a simple thing to find out, but I'm struggling. I have
googled, but everything I find is about implicit conversion,
not explicit.
Is this implementation-specific, or does ANSI/ISO lay out what
should happen for:
--------------------------
signed char sc;
unsigned char uc;
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by: Alex Sedow |
last post by:
Why explicit conversion from SomeType* to IntPtr is not ambiguous (according
to standart)?
Example:
// System.IntPtr
class IntPtr
{
public static explicit System.IntPtr (int);
public static explicit System.IntPtr (long);
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by: Michael C |
last post by:
If a class inherits from another class, say Form inherits from control, then
I can assign the Form to a variable of type Control without needing an
explicit conversion, eg
Form1 f = new Form1();
Control c = f;
An enum value inherits from int but it doesn't get implicitly converted:
HorizontalAlignment h = HorizontalAlignment.Center;
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by: petschy |
last post by:
hello,
i've run into an error when qualifying a copy ctor 'explicit'. the
strange thing is that i get a compiler error only if the class is a
template and declare the variable as X<Zx = y. X<Zx(y) is fine.
Tested with gcc 2.95, 3.3, 4.1, all gave the same error:
t.cpp: In function 'int main()':
t.cpp:44: error: no matching function for call to
'D<int>::D(D<int>&)'
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by: coder_lol |
last post by:
Thanks everyone again for contributing to helping me clear C++
confusions. I did some serious reading on copy constructors and
assignments and I think I've got a good handle on the memory stuff.
Well, I came across Scott Meyer's SmartPtr example from some 10 years
ago. I like the template member function for type conversion to solve
inheritance issues.
On MSVS 2003, I get the below error, if I declare the constructor
SmartPtr(T*...
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by: Rahul |
last post by:
Hi Everyone,
I have the following code and i'm able to invoke the destructor
explicitly but not the constructor. and i get a compile time error
when i invoke the constructor, why is this so?
class Trial
{
public: Trial()
{
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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