How can I pass signal or slot (member-function, new syntax in Qt 5) as a parameter to function and then call connect?
Qt/C - Lesson 024. Signals and Slot in Qt5. Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget) connect (sender, SIGNAL (valueChanged (QString, QString)), receiver, SLOT (updateValue (QString))); New: connecting to QObject member.
e.g. I want to write a function that waits for a signal.
- The new Qt5 connection syntax # The conventional connect syntax that uses SIGNAL and SLOT macros works entirely at runtime, which has two drawbacks: it has some runtime overhead (resulting also in binary size overhead), and there's no compile-time correctness checking. The new syntax addresses both issues.
- Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal. Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time. Signals and slots can take any number of arguments of any type.
Note: It is not compile - PointerToMemberFunction is my question.
Is there any way to pass list of signals to this function for connection?
C++11 Allocation Requirement on Strings
c++,string,c++11,memory,standards
Section 21.4.1.5 of the 2011 standard states: The char-like objects in a basic_string object shall be stored contiguously. That is, for any basic_string object s, the identity &*(s.begin() + n) &*s.begin() + n shall hold for all values of n such that 0 <= n < s.size(). The two..
Same function with and without template
c++,c++11
The main reason to do something like this is to specialize void integerA(int x) to do something else. That is, if the programmer provides as input argument an int to member function abc::integerA then because of the C++ rules instead of instantiating the template member function the compiler would pick..
Get an ordered list of files in a folder
c++,boost,boost-filesystem
The fanciest way I've seen to perform what you want is straight from the boost filesystem tutorial. In this particular example, the author appends the filename/directory to the vector and then utilizes a std::sort to ensure the data is in alphabetical order. Your code can easily be updated to use..
C++ template template
c++,templates
Your issue is that std::deque (and other standard containers) doesn't just take a single template argument. As well as the stored type, you can specify an allocator functor type to use. If you don't care about these additional arguments, you can just take a variadic template template and be on..
Validate case pattern (isupper/islower) on user input string
c++,user-input
The simplest thing you can do is to use a for/while loop. A loop will basically repeat the same instruction for a number of n steps or until a certain condition is matched. The solution provided is pretty dummy, if you want to read the first name and last name..
Test if string represents 'yyyy-mm-dd'
c++,command-line-arguments
If you can use boost library you could simple do it like this: string date('2015-11-12'); string format('%Y-%m-%d'); date parsedDate = parser.parse_date(date, format, svp); You can read more about this here. If you want a pure C++ solution you can try using struct tm tm; std::string s('2015-11-123'); if (strptime(s.c_str(), '%Y-%m-%d', &tm))..
Strings vs binary for storing variables inside the file format
c++,file,hdf5,dataformat
Speaking as someone who's had to do exactly what you're talking about a number of time, rr got it basically right, but I would change the emphasis a little. For file versioning, text is basically the winner. Since you're using an hdf5 library, I assume both serializing and parsing are..
Method returning std::vector<>>
Your error is actually coming from: array.push_back(day); This tries to put a copy of day in the vector, which is not permitted since it is unique. Instead you could write array.push_back( std::move(day) ); however the following would be better, replacing auto day..: array.emplace_back(); ..
Passing something as this argument discards qualifiers
c++,c++11
There are no operator[] of std::map which is const, you have to use at or find: template<> struct Record::getDispatcher { static std::string impl(Record const& rec, std::string& const field) { return rec.fieldValues_.at(field); // throw if field is not in map. } }; or template<> struct Record::getDispatcher { static std::string impl(Record const&..
C++ & Qt: Random string from an array area
c++,arrays,string,qt,random
You should use the random header. #include std::default_random_engine generator; std::uniform_int_distribution dist(0, 5); int StringIndex = dist(generator); std::string ChosenString = characters[StringIndex]; The above will generate a random index into your array. If you want to limit the range, change the constructor of dist, for example (dist(0,2) would only allow for..
undefined reference to `vtable for implementation' error
c++,build,makefile
I think you just misspelled CFLAGS in CFLAGES=-c -Wall I'm guessing this is the case since g++ ./src/main.cpp -I ./include/ does not have the -c option..
Rotating a Label In Qt with Python
python,qt
Not 100% sure what you're trying to achieve, but rotating the image / pixmap and leaving the label's paintEvent unchanged seems easier: # load your image image = QtGui.QPixmap(_fromUtf8(':/icons/BOOM_OUT.png')) # prepare transform t = QtGui.QTransform() t.rotate(45) # rotate the pixmap rotated_pixmap = pixmap.transformed(t) # and let the label show the..
How can I access the members of a subclass from a superclass with a different constructor?
c++,inheritance,constructor,subclass,superclass
This map: typedef map obj_map; only stores Object objects. When you try to put an Image in, it is sliced down and you lose everything in the Image that was not actually part of Object. The behaviour that you seem to be looking for is called polymorphism. To activate..
.cpp:23: error: cannot convert ‘std::string' to ‘const char*' for argument ‘1' to ‘int atoi(const char*)'
c++,string
Use stoi, it's the modern C++ version of C's atoi. Update: Since the original answer text above the question was amended with the following error message: ‘stoi' was not declared in this scope Assuming this error was produced by g++ (which uses that wording), this can have two different causes:..
Can python script know the return value of C++ main function in the Android enviroment
python,c++
For your android problem you can use fb-adb which 'propagates program exit status instead of always exiting with status 0' (preferred), or use this workaround (hackish.. not recommended for production use): def run_exe_return_code(run_cmd): process=subprocess.Popen(run_cmd + '; echo $?',stdout=subprocess.PIPE,shell=True) (output,err)=process.communicate() exit_code = process.wait() print output print err print exit_code return exit_code..
Parameters to use in a referenced function c++
c++,pointers,reference
Your code makes no sense, why are you passing someStruct twice? For the reference part, you should have something like: void names(someStruct &s) { // <<<< Pass struct once as a reference cout << 'First Name: ' << 'n'; cin >> s.firstname; cout << 'Last Name: ' << 'n'; cin..
Checking value of deleted object
It is very bad, accessing deleted objects as if they were not deleted will in the general case crash. There is no guarantee that the memory is still mapped inside the process and it could result in a virtual memory page fault. It is also likely that the memory will..
template template class specialization
c++,templates,template-specialization
The specialization still needs to be a template template argument. You passed in a full type. You want: template class random_gen { .. }; Just std::uniform_real_distribution, not std::uniform_distribution. ..
No match for 'operator*' error
c++,c++11
As @101010 hints at: pay is a string, while hours_day is a float, and while some languages allow you to multiply strings with integers, c++11 (or any other flavor of c) doesn't, much less allow strings and floats to be multiplied together.
create vector of objects on the stack ? (c++)
c++,vector,heap-memory
Yes, those objects still exist and you must delete them. Alternatively you could use std::vector> instead, so that your objects are deleted automatically. Or you could just not use dynamic allocation as it is more expensive and error-prone. Also note that you are misusing reserve. You either want to use..
Copy text and placeholders, variables to the clipboard
c++,qt,clipboard
You're not using the function setText correctly. The canonical prototype is text(QString & subtype, Mode mode = Clipboard) const from the documentation. What you want to do is assemble your QString ahead of time and then use that to populate the clipboard. QString message = QString('Just a test text. And..
segfault accessing qlist element through an iterator
c++,iterator,qlist
(Edited away first 'answer', this is an actual attempt at an answer) My guess: QList messages() const { return _messages; } It's returning a copy of the QList _messages, rather than a reference to it. I'm not sure that it would give the results you're seeing, but it looks wrong..
opencv window not refreshing at mouse callback
c++,opencv
your code works for me. But you used cv::waitKey(0) which means that the program waits there until you press a keyboard key. So try pressing a key after drawing, or use cv::waitKey(30) instead. If this doesnt help you, please add some std::cout in your callback function to verify it is..
Translating a character array into a integer string in C++
c++,arrays,string
If you want a sequence of int, then use a vector. Using the key_char string, the values of the chars in it will serve as the initial value of the ints. std::vector key_num(key_char.begin(), key_char.end()); Then, iterate over each character of key_num and convert it to the equivalent int value for..
Add more features to stack container
c++,visual-c++,stl
If this is interview question or something , and you have to do it anyways , you can do this like ,below code . derive from std::stack , and overload [] operator #include #include #include #include #include template class myStack:public std::stack { public:..
Type function that returns a tuple of chosen types
c++,templates,c++11,metaprogramming
You can do this without recursion by simply expanding the parameter pack directly into a std::tuple: template struct Tuple { using type = std::tuple::type..>; }; To answer your question more directly, you can declare a variadic primary template, then write two specializations: for when there are at least..
Make a triangle shape in C++
This code works fine for a right angled triangle - * ** *** But I guess you want a triangle like this - * *** ***** Try this - #include using namespace std; int main() { int i, j, k, n; cout << 'Please enter number of rows you..
ctypes error AttributeError symbol not found, OS X 10.7.5
python,c++,ctypes
Your first problem is C++ name mangling. If you run nm on your .so file you will get something like this: nm test.so 0000000000000f40 T __Z3funv U _printf U dyld_stub_binder If you mark it as C style when compiled with C++: #ifdef __cplusplus extern 'C' char fun() #else char fun(void)..
Confused about returns in stack template
c++,templates,generic-programming
This depends on what you want the behaviour (protocol) of your class to be. Since you're logging into the error stream there, I assume you consider this an error condition to call pop() on an empty stack. The standard C++ way of signalling errors is to throw an exception. Something..
MFC visual c++ LNK2019 link error
c++,mfc
The header file provides enough information to let you declare variables. And for that matter to just compile (but not link) code. When you link, the linker has to resolve e.g. function references such as a reference to ServerConnection::getLicenceRefused, by bringing in the relevant machine code. You have to tell..
C++ Isn't this a useless inline declaration?
c++,inline,private,member,protected
The Compiler can Access everything. The restrictions are only valid for the programmer. This means there are no restrictions for the Compiler to Access any variables! At the end every variable is just translated to an address which can be accessed. So for the Compiler it is no Problem to..
pointer to pointer dynamic array in C++
c++,arrays,pointers
The valid range of indices of an array with N elements is [0, N-1]. Thus instead of for example this loop for (int i=1; i <= n; i++) ^^^^ ^^^^^^ you have to write for ( int i = 0; i < n; i++ ) As you used operator new..
dispatch response packet according to packet sequence id
c++,boost,boost-asio
You could use std::promise and std::future (or their boost counterparts if your are not yet on C++11). The idea is to store a std::shared_ptr> with the current sequence id as a key in the map whenever a request is sent. In the blocking send function you wait for the corresponding..
Incorrect Polar - Cartesian Coordinate Conversions. What does -0 Mean?
c++,polar-coordinates,cartesian-coordinates
You are converting to cartesian the points which are in cartesian already. What you want is: std::cout << 'Cartesian Coordinates:' << std::endl; std::cout << to_cartesian(to_polar(a)) << std::endl; std::cout << to_cartesian(to_polar(b)) << std::endl; //.. Edit: using atan2 solves the NaN problem, (0, 0) is converted to (0, 0) which is fine..
std::condition_variable – notify once but wait thread wakened twice
c++,multithreading
Converting comments into answer: condition_variable::wait(lock, pred) is equivalent to while(!pred()) wait(lock);. If pred() returns true then no wait actually takes place and the call returns immediately. Your first wake is from the notify_one() call; the second 'wake' is because the second wait() call happens to execute after the Stop() call,..
Passing iterator's element to a function: wrong type of pointer
c++,pointers,stl,iterator
Preferred option: change isPrime to take a long (and pass *it to it). Secondary option: pass &*it instead of it. Your original code doesn't work because it is an iterator (which is a class) whereas the function expected long int * and there is no implicit conversion from iterator to..
How to avoid user to click outside popup Dialog window using Qt and Python?
qt,user-interface,python-3.x,dialog,qt-creator
use setModal() like so; dialog.setModal(1); Or; dialog.setModal(true); ..
Issue when use two type-cast operators in template class
What you're trying to do makes little sense. We have subclass. It is convertible to int&, but also to a lot of other reference types. char&. bool&. double&. The ambiguity arises from the fact that all the various overloads for operator<< that take any non-template argument are viable overload candidates..
3 X 3 magic square recursively
c++,algorithm,math,recursion
Basically, you are finding all permutations of the array using a recursive permutation algorithm. There are 4 things you need to change: First, start your loop from pos, not 0 Second, swap elements back after recursing (backtracking) Third, only test once you have generated each complete permutation (when pos =..
Explicit instantiation of class template not instantiating constructor
c++,templates,constructor,explicit-instantiation
When the constructor is a template member function, they are not instantiated unless explicitly used. You would see the code for the constructor if you make it a non-template member function. template class test { public: /*** template test(T param) { parameter = param; }; ***/ test(T param)..
OpenCV - Detection of moving object C++
c++,opencv
Plenty of solutions are possible. A geometric approach would detect that the one moving blob is too big to be a single passenger car. Still, this may indicate a car with a caravan. That leads us to another question: if you have two blobs moving close together, how do you..
How can I tell clang-format to follow this convention?
c++,clang-format
Removing BreakBeforeBraces: Allman Seems to do what you want (for me). I'm using SVN clang though. Although you probably wanted it there for a reason. According to the clang-format docs, the AllowShortBlocksOnASingleLine should do exactly what you want (regardless of brace style). This might be a bug in clang-format..
how to sort this vector including pairs
c++,vector
You forgot the return statement in the function bool func(const pair >&i , const pair >&j ) { i.second.first < j.second.first ; } Write instead bool func(const pair >&i , const pair >&j ) { return i.second.first < j.second.first ; } Also you should include header where class std::pair..
Undefined behaviour or may be something with memset
c++,undefined-behavior
The A[32] in the method is actually just a pointer to A. Therefore, sizeof is the size of *int. Take the following test code: void szof(int A[32]) { std::cout << 'From method: ' << sizeof(A) << 'n'; } int main(int argc, char *argv[]) { int B[32]; std::cout << 'From main:..
Marshal struct in struct from c# to c++
c#,c++,marshalling
Change this: [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 36)] private string iu; to this: [MarshalAs(UnmanagedType.LPStr)] private string iu; Note that this code is good only to pass a string in the C#->C++ direction. For the opposite direction (C++->C#) it is more complex, because C# can't easily deallocate C++ allocated memory. Other important thing:..
How can I convert an int to a string in C++11 without using to_string or stoi?
c++,string,c++11,gcc
Its not the fastest method but you can do this: #include #include #include template std::string stringulate(ValueType v) { std::ostringstream oss; oss << v; return oss.str(); } int main() { std::cout << ('string value: ' + stringulate(5.98)) << 'n'; } ..
Why are shaders and programs stored as integers in OpenGL?
c++,opengl,opengl-es,integer,shader
These integers are handles.This is a common idiom used by many APIs, used to hide resource access through an opaque level of indirection. OpenGL is effectively preventing you from accessing what lies behind the handle without using the API calls. From Wikipedia: In computer programming, a handle is an abstract..
Implicit use of initializer_list
c++,c++11,initializer-list
Your program is not ill-formed because is guaranteed to include (the same is true for all standard library containers) §23.3.1 [sequences.general] Header synopsis #include .. Searching the standard for #include reveals the header is included along with the following headers ..
This is the sequel of my previous article explaining the implementation details of the signals and slots.In the Part 1, we have seenthe general principle and how it works with the old syntax.In this blog post, we will see the implementation details behind thenew function pointerbased syntax in Qt5.
New Syntax in Qt5
The new syntax looks like this:
Why the new syntax?
I already explained the advantages of the new syntax in adedicated blog entry.To summarize, the new syntax allows compile-time checking of the signals and slots. It also allowsautomatic conversion of the arguments if they do not have the same types.As a bonus, it enables the support for lambda expressions.
New overloads
There was only a few changes required to make that possible.
The main idea is to have new overloads to QObject::connect which take the pointersto functions as arguments instead of char*
There are three new static overloads of QObject::connect: (not actual code)
The first one is the one that is much closer to the old syntax: you connect a signal from the senderto a slot in a receiver object.The two other overloads are connecting a signal to a static function or a functor object withouta receiver.
They are very similar and we will only analyze the first one in this article.
Pointer to Member Functions
Before continuing my explanation, I would like to open a parenthesis totalk a bit about pointers to member functions.
Here is a simple sample code that declares a pointer to member function and calls it.
Pointers to member and pointers to member functions are usually part of the subset of C++ that is not much used and thus lesser known.
The good news is that you still do not really need to know much about them to use Qt and its new syntax. All you need to remember is to put the & before the name of the signal in your connect call. But you will not need to cope with the ::*, .* or ->* cryptic operators.
These cryptic operators allow you to declare a pointer to a member or access it.The type of such pointers includes the return type, the class which owns the member, the types of each argumentand the const-ness of the function.
You cannot really convert pointer to member functions to anything and in particular not tovoid* because they have a different sizeof.
If the function varies slightly in signature, you cannot convert from one to the other.For example, even converting from void (MyClass::*)(int) const tovoid (MyClass::*)(int) is not allowed.(You could do it with reinterpret_cast; but that would be an undefined behaviour if you callthem, according to the standard)
Pointer to member functions are not just like normal function pointers.A normal function pointer is just a normal pointer the address where thecode of that function lies.But pointer to member function need to store more information:member functions can be virtual and there is also an offset to apply to thehidden this in case of multiple inheritance.sizeof of a pointer to a member function can evenvary depending of the class.This is why we need to take special care when manipulating them.
Type Traits: QtPrivate::FunctionPointer
Let me introduce you to the QtPrivate::FunctionPointer type trait.
A trait is basically a helper class that gives meta data about a given type.Another example of trait in Qt isQTypeInfo.
What we will need to know in order to implement the new syntax is information about a function pointer.
The template struct FunctionPointer will give us informationabout T via its member.
ArgumentCount: An integer representing the number of arguments of the function.Object: Exists only for pointer to member function. It is a typedef to the class of which the function is a member.Arguments: Represents the list of argument. It is a typedef to a meta-programming list.call(T &function, QObject *receiver, void **args): A static function that will call the function, applying the given parameters.
Qt still supports C++98 compiler which means we unfortunately cannot require support for variadic templates.Therefore we had to specialize our trait function for each number of arguments.We have four kinds of specializationd: normal function pointer, pointer to member function,pointer to const member function and functors.For each kind, we need to specialize for each number of arguments. We support up to six arguments.We also made a specialization using variadic templateso we support arbitrary number of arguments if the compiler supports variadic templates.
The implementation of FunctionPointer lies inqobjectdefs_impl.h.
QObject::connect
The implementation relies on a lot of template code. I am not going to explain all of it.
Here is the code of the first new overload fromqobject.h:
You notice in the function signature that sender and receiverare not just QObject* as the documentation points out. They are pointers totypename FunctionPointer::Object instead.This uses SFINAEto make this overload only enabled for pointers to member functionsbecause the Object only exists in FunctionPointer ifthe type is a pointer to member function.
We then start with a bunch ofQ_STATIC_ASSERT.They should generate sensible compilation error messages when the user made a mistake.If the user did something wrong, it is important that he/she sees an error hereand not in the soup of template code in the _impl.h files.We want to hide the underlying implementation from the user who should not needto care about it.
That means that if you ever you see a confusing error in the implementation details,it should be considered as a bug that should be reported.
We then allocate a QSlotObject that is going to be passed to connectImpl().The QSlotObject is a wrapper around the slot that will help calling it. It alsoknows the type of the signal arguments so it can do the proper type conversion.
We use List_Left to only pass the same number as argument as the slot, which allows connectinga signal with many arguments to a slot with less arguments.
QObject::connectImpl is the private internal functionthat will perform the connection.It is similar to the original syntax, the difference is that instead of storing amethod index in the QObjectPrivate::Connection structure,we store a pointer to the QSlotObjectBase.
The reason why we pass &slot as a void** is only tobe able to compare it if the type is Qt::UniqueConnection.
We also pass the &signal as a void**.It is a pointer to the member function pointer. (Yes, a pointer to the pointer)
Signal Index
We need to make a relationship between the signal pointer and the signal index.
We use MOC for that. Yes, that means this new syntaxis still using the MOC and that there are no plans to get rid of it :-).
MOC will generate code in qt_static_metacallthat compares the parameter and returns the right index.connectImpl will call the qt_static_metacall function with thepointer to the function pointer.
Once we have the signal index, we can proceed like in the other syntax.
Qt5 Signal Slot Syntax Example
The QSlotObjectBase
QSlotObjectBase is the object passed to connectImplthat represents the slot.
Before showing the real code, this is what QObject::QSlotObjectBasewas in Qt5 alpha:
It is basically an interface that is meant to be re-implemented bytemplate classes implementing the call and comparison of thefunction pointers.
It is re-implemented by one of the QSlotObject, QStaticSlotObject orQFunctorSlotObject template class.
Fake Virtual Table
Qt5 Signal Slot Syntax Analyzer
The problem with that is that each instantiation of those object would need to create a virtual table which contains not only pointer to virtual functionsbut also lot of information we do not need such asRTTI.That would result in lot of superfluous data and relocation in the binaries.
In order to avoid that, QSlotObjectBase was changed not to be a C++ polymorphic class.Virtual functions are emulated by hand.
The m_impl is a (normal) function pointer which performsthe three operations that were previously virtual functions. The 're-implementations'set it to their own implementation in the constructor.
Please do not go in your code and replace all your virtual functions by such ahack because you read here it was good.This is only done in this case because almost every call to connectwould generate a new different type (since the QSlotObject has template parameterswich depend on signature of the signal and the slot).
Protected, Public, or Private Signals.
Signals were protected in Qt4 and before. It was a design choice as signals should be emittedby the object when its change its state. They should not be emitted fromoutside the object and calling a signal on another object is almost always a bad idea.
However, with the new syntax, you need to be able take the addressof the signal from the point you make the connection.The compiler would only let you do that if you have access to that signal.Writing &Counter::valueChanged would generate a compiler errorif the signal was not public.
In Qt 5 we had to change signals from protected to public.This is unfortunate since this mean anyone can emit the signals.We found no way around it. We tried a trick with the emit keyword. We tried returning a special value.But nothing worked.I believe that the advantages of the new syntax overcome the problem that signals are now public.
Sometimes it is even desirable to have the signal private. This is the case for example inQAbstractItemModel, where otherwise, developers tend to emit signalfrom the derived class which is not what the API wants.There used to be a pre-processor trick that made signals privatebut it broke the new connection syntax.
A new hack has been introduced.QPrivateSignal is a dummy (empty) struct declared private in the Q_OBJECTmacro. It can be used as the last parameter of the signal. Because it is private, only the objecthas the right to construct it for calling the signal.MOC will ignore the QPrivateSignal last argument while generating signature information.See qabstractitemmodel.h for an example.
More Template Code
The rest of the code is inqobjectdefs_impl.h andqobject_impl.h.It is mostly standard dull template code.
I will not go into much more details in this article,but I will just go over few items that are worth mentioning.
Meta-Programming List
As pointed out earlier, FunctionPointer::Arguments is a listof the arguments. The code needs to operate on that list:iterate over each element, take only a part of it or select a given item.
That is why there isQtPrivate::List that can represent a list of types. Some helpers to operate on it areQtPrivate::List_Select andQtPrivate::List_Left, which give the N-th element in the list and a sub-list containingthe N first elements.
The implementation of List is different for compilers that support variadic templates and compilers that do not.
With variadic templates, it is atemplate struct List;. The list of arguments is just encapsulatedin the template parameters.
For example: the type of a list containing the arguments (int, QString, QObject*) would simply be:
Without variadic template, it is a LISP-style list: template struct List;where Tail can be either another List or void for the end of the list.
The same example as before would be:
ApplyReturnValue Trick
In the function FunctionPointer::call, the args[0] is meant to receive the return value of the slot.If the signal returns a value, it is a pointer to an object of the return type ofthe signal, else, it is 0.If the slot returns a value, we need to copy it in arg[0]. If it returns void, we do nothing.
The problem is that it is not syntaxically correct to use thereturn value of a function that returns void.Should I have duplicated the already huge amount of code duplication: once for the voidreturn type and the other for the non-void?No, thanks to the comma operator.
In C++ you can do something like that: Winpot casino merida yucatan.
You could have replaced the comma by a semicolon and everything would have been fine.
Where it becomes interesting is when you call it with something that is not void:
Silber jeton casino austria. There, the comma will actually call an operator that you even can overload.It is what we do inqobjectdefs_impl.h
Poker tournaments in genesee county. All tournaments, cashgames, casinos, pokerrooms and the best hotel & flight offers in and around Logan.
ApplyReturnValue is just a wrapper around a void*. Then it can be usedin each helper. This is for example the case of a functor without arguments:
This code is inlined, so it will not cost anything at run-time.
Conclusion
This is it for this blog post. There is still a lot to talk about(I have not even mentioned QueuedConnection or thread safety yet), but I hope you found thisinterresting and that you learned here something that might help you as a programmer.
Update:The part 3 is available.
