I want to know what happens if we have a function parameter that is a reference to a const function as shown below. Version 1 int anotherFunc() { std::cout<<"inside anotherFunc"<<std::endl; return 5; } void func(decltype(anotherFunc) const &someFunction)//note the const here { std::cout<<"inside func"<<std::endl; std::cout<<someFunction()<<std::endl; } int main() { std::cout << "Hello World" << std::endl; func(anotherFunc); ..
Category : c++11
In C++ type traits std::is_integral<T>::value returns true even if T is bool which is correct as per its description. But if bool is a different type than other integral types, why its considered as integral type in this case? why we don’t have a separate std::is_boolean type trait? #include <iostream> #include <type_traits> int main() { ..
I’m using binary files with fstream, so, after reading the start of a new cycle, I use .eof() to end the function. Howevever, I need to read this file multiple times, so, everytime I call the function, I use .seekg(0, ios::beg) to "rewind" the file. The problem is, after I do this, .eof() stops working ..
I have two class that follow this manner to encapsulate threads inside a C++ object. class MyThreadClass { public: MyThreadClass() {/* empty */} virtual ~MyThreadClass() {/* empty */} /** Returns true if the thread was successfully started, false if there was an error starting the thread */ bool StartInternalThread() { return (pthread_create(&_thread, NULL, InternalThreadEntryFunc, this) ..
This is the signature of std::align void* align( std::size_t alignment, std::size_t size, void*& ptr, std::size_t& space ); Why does it take in void*& if it already returns adjusted pointer? Am I missing something? Source: Windows Que..
This is my Code : Input My array to be split from half of its value then for both arrays it should find minimum and a maximum IT SHOWS NO OUTPUT But return a value can someone help what is the problem here. USED : 1.Function for finding minimum 2. Function for finding maximum 3. ..
Let’s say that I want to make use of base class constructor in order to create derived class objects. That’s my approach on how to do it: class base { int x, y, z; public: base(int x, int y, int z) : x(x), y(y), z(z) { std::cout << "base class constructor calledn"; } int get_x() ..
Say I have a class which is a wrapper around stl::list and I want to be able to use range looping: #include <list> using std::list; template <typename T> class list_wrapper { public: list<T> _list; typename list<T>::const_iterator begin() { return l.begin(); } typename list<T>::const_iterator end() { return l.end(); } typename list<T>::iterator begin() { return l.begin(); } ..
Lets say I have this class: template <class T> class Test { Test(T* x); const T* const t; int i{0}; }; I want t to always be initialized with x: template <class T> Test<T>::Test(T* x) : t{x} {} And I have two specializations: template <> Test<Foo>::Test(Foo* x) : t{x} { i = 1; } template ..
In a thread which has not ever called and would never call asio::io_context.run(), must I invoke post() or dispatch() to dispatch tasks to the thread which has called asio::io_context.run()? Is it safe to directly call asio::async_write() or asio::async_read() in a thread which has not ever called and would never call asio::io_context.run() to dispatch tasks to ..
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