In C++ specifies constructors and conversion operators that don't allow implicit conversions or copy-initialization. In C# declares a user-defined type conversion operator that must be invoked with a cast. For MS SQL Server for-xml-EXPLICIT mode use the [for-xml-explicit] tag
Questions tagged [explicit]
405 questions
5
votes
1 answer
Construct tuple by passing the same argument to each element with explicit constructor
The following works fine on Visual C++ 2015 Update 2. Note that A is non-copyable and A::A is explicit.
#include
#include
struct A
{
explicit A(int i)
{
std::cout << i << " ";
}
// non-copyable
…
isanae
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5
votes
2 answers
Pros / Cons of Tacit Programming in J
As a beginner in J I am often confronted with tacit programs which seem quite byzantine compared to the more familiar explicit form.
Now just because I find interpretation hard does not mean that the tacit form is incorrect or wrong. Very often…
user1202733
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5
votes
3 answers
Explicit C# interface implementation of interfaces that inherit from other interfaces
Consider the following three interfaces:
interface IBaseInterface
{
event EventHandler SomeEvent;
}
interface IInterface1 : IBaseInterface
{
...
}
interface IInterface2 : IBaseInterface
{
...
}
Now consider the following class that…
anthony
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5
votes
2 answers
Do you have to explicitly create instance of form in VB.NET?
If a project contains a Form class, can the form be shown by:
Form1.Show
or does an instance of the form need to be created first?
Dim frm As New Form1
frm.Show
CJ7
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5
votes
1 answer
explicit template instantiation: MSVC vs. GCC
I'm trying to deal with namespaces & templates in C++. I can get the following code to compile in MSVC (no warnings or errors), but am having no luck at all with various permutations with CYGWIN/GCC. Any help would be appreciated.
In the header…
Rob Bryce
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5
votes
3 answers
Explicit Loading of DLL
I'm trying to explicitly link with a DLL. No other resources is available except the DLL file itself and some documentation about the classes and its member functions.
From the documentation, each class comes with its own
member typedef
example:…
justin
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5
votes
3 answers
Why certain implicit type conversions are safe on a machine and not on an other?? How can I prevent this cross platform issues?
I recently found a bug on my code that took me a few hours to debug.
the problem was in a function defined as:
unsigned int foo(unsigned int i){
long int v[]={i-1,i,i+1} ;
.
.
.
return x ; // evaluated by the function but…
lucacerone
- 9,859
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5
votes
2 answers
Should I explicitly define the values my enumerated constants
I've heard before that I should simply let the compiler choose which values to assign for enumerated constants if I'm not doing something clever like using the values as bitmasks. If I'm just using enumeration values for more explicit code…
Joel B
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4
votes
1 answer
How does the 'explicit' keyword affect C++ copy constructors and function parameters?
The "explicit" keyword to modify the copy constructor can cause problems.
Objects passed as function parameters are particularly susceptible to these issues.
here are my codes:
#include
#include
class Pig{
public:
…
Andrés
- 41
- 2
4
votes
1 answer
Why does shared_ptr p; p=nullptr; compile?
Since the constructor of std::shared_ptr is marked as explicit one, so expressions like auto p = std::make_shared(1); p = new int(6); is wrong.
My question is why does std::make_shared(1); p = nullptr; compile?
Here is the aforementioned…
John
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4
votes
4 answers
Why std::pair calls explicit constructors in assignment
Consider the following code:
#include
#include
struct Base
{
int baseint;
};
struct Der1 : Base
{
int der1int;
Der1() : der1int(1) {}
explicit Der1(const Base& a) : Base(a), der1int(1)
{
std::cerr <<…
Rafał Rawicki
- 22,324
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- 79
4
votes
2 answers
QDialog explicit constructor without argument - how to use correctly?
I experienced this with a derived class, but it's the same with QDialog base class:
when I do
QDialog dialog();
dialog.exec();
the compiler complains
J:\...\mainwindow.cpp:-1: In member function 'void…
friede
- 137
- 8
4
votes
1 answer
Android Override Explicit Intent
My app needs to have a intent-filter that responds to a Intent that has it's component set (a explicit intent.) Here is a example.
Intent i = new…
Isaac Waller
- 32,709
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4
votes
2 answers
Make argument explicit?
explicit can be used on eg. a constructor or conversion function to avoid implicitly calling that constructer/conversion - in short.
Im interested in if it is possible to make a single argument explicit somehow (short of roling a new type) ? perhaps…
darune
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4
votes
1 answer
What conversions does the conversion constructor do if an object is created and assigned a value?
If I have a class with a constructor like this:
class A {
public:
A(int e) {
// Use the `e` value
}
};
And if I make calls like this:
int main() {
A obj = 'c';
}
What conversions would take place? Would a conversion to type A take…
Amith
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