472,967 Members | 1,725 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 472,967 software developers and data experts.

Explicit template arguments for operator()

It seems impossible to explicitly specify template arguments for an
overloaded operator() without giving the full name. I'd like to know
where in the C++ standard this behavior is defined. I can't seem to
find it. Here's some code the shows what I'm talking about:

#include <iostream>

using namespace std;

class Foo {
public:
template <typename Func>
void operator()() {
cout << "Foo::operator()\n";
Func()();
}
};

class Bar {
public:
void operator()() {
cout << "Bar::operator()\n";
}
};

int main() {
Foo f;

// Cannot deduce Func
f();

// Illegal expression
f<Bar>();

// Works fine
f.operator()<Bar>();
}
Sep 17 '08 #1
1 1424
On 9月17日, 下午9时46分, James Daughtry <mordoc...@hotmail.comwrote:
It seems impossible to explicitly specify template arguments for an
overloaded operator() without giving the full name. I'd like to know
where in the C++ standard this behavior is defined. I can't seem to
find it. Here's some code the shows what I'm talking about:
14.8.1/5 give some 'note' closely on this, but not exactly,
I wonder adding something about 'overloaded operators' here is
approriate.

--
Best Regards
Barry
Sep 18 '08 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

4
by: C. Carbonera | last post by:
/* Hi, I have a problem with explicit instantiation of templates in Visual C++ 6.0. I have provided the source below. I have an example of a function template that produces incorrect output in...
5
by: BCC | last post by:
In looking through some code I have inherited, I notice a lot of places where the programmer used operator() as a function call: void operator() (int x, int y); Rather than an explicit...
9
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...
4
by: Mat DeLong | last post by:
I have never been stuck on programming something before to the point I give up... this is a first. I am programming what should be something very easy in C++... using Templates. Here is the code,...
3
by: IR | last post by:
Hi, I've been trying to do the following (which doesn't compile) : template<class T, class F = Example<T struct Example { F foo(); };
1
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....
42
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. ...
7
by: Protoman | last post by:
Is this an efficient way to integrate an explicit function of x from a to b: #include <iostream> using namespace std; class Integrate { public: Integrate(long double (*f)(long double&...
2
by: Barry | last post by:
The following code compiles with VC8 but fails to compiles with Comeau online, I locate the standard here: An explicit specialization of any of the following:
0
by: lllomh | last post by:
Define the method first this.state = { buttonBackgroundColor: 'green', isBlinking: false, // A new status is added to identify whether the button is blinking or not } autoStart=()=>{
0
by: Aliciasmith | last post by:
In an age dominated by smartphones, having a mobile app for your business is no longer an option; it's a necessity. Whether you're a startup or an established enterprise, finding the right mobile app...
4
NeoPa
by: NeoPa | last post by:
Hello everyone. I find myself stuck trying to find the VBA way to get Access to create a PDF of the currently-selected (and open) object (Form or Report). I know it can be done by selecting :...
3
NeoPa
by: NeoPa | last post by:
Introduction For this article I'll be using a very simple database which has Form (clsForm) & Report (clsReport) classes that simply handle making the calling Form invisible until the Form, or all...
1
by: Teri B | last post by:
Hi, I have created a sub-form Roles. In my course form the user selects the roles assigned to the course. 0ne-to-many. One course many roles. Then I created a report based on the Course form and...
3
by: nia12 | last post by:
Hi there, I am very new to Access so apologies if any of this is obvious/not clear. I am creating a data collection tool for health care employees to complete. It consists of a number of...
0
NeoPa
by: NeoPa | last post by:
Introduction For this article I'll be focusing on the Report (clsReport) class. This simply handles making the calling Form invisible until all of the Reports opened by it have been closed, when it...
0
isladogs
by: isladogs | last post by:
The next online meeting of the Access Europe User Group will be on Wednesday 6 Dec 2023 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, Mike...
2
by: GKJR | last post by:
Does anyone have a recommendation to build a standalone application to replace an Access database? I have my bookkeeping software I developed in Access that I would like to make available to other...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.