There are four main cases where you should use pass-by-reference over pass-by-value: If you are calling a function that needs to modify its arguments, use pass-by-reference or pass-by-pointer. Otherwise, you’ll get a copy of the argument. If you’re calling a function that needs to take a large object as a parameter, pass it by const … Read more
The canonical form is this: #include<iterator> // … std::ifstream testFile(“testfile”, std::ios::binary); std::vector<char> fileContents((std::istreambuf_iterator<char>(testFile)), std::istreambuf_iterator<char>()); If you are worried about reallocations then reserve space in the vector: #include<iterator> // … std::ifstream testFile(“testfile”, std::ios::binary); std::vector<char> fileContents; fileContents.reserve(fileSize); fileContents.assign(std::istreambuf_iterator<char>(testFile), std::istreambuf_iterator<char>());
You cannot partially specialize only a single member function, you must partially specialize the whole class. Hence you’ll need something like: template <typename T> class Object<T, 0> { private: T m_t; Object(); public: Object(T t): m_t(t) {} T Get() { return m_t; } Object& Deform() { std::cout << “Spec\n”; m_t = -1; return *this; } … Read more
What happens in this code is: const char * returnCharPtr() { std::string someString(“something”); return someString.c_str(); } instance of std::string is created – it is an object with automatic storage duration pointer to the internal memory of this string is returned object someString is destructed and the its internal memory is cleaned up caller of this … Read more
Example using C++11: #include <iostream> #include <future> #include <thread> #include <chrono> static std::string getAnswer() { std::string answer; std::cin >> answer; return answer; } int main() { std::chrono::seconds timeout(5); std::cout << “Do you even lift?” << std::endl << std::flush; std::string answer = “maybe”; //default to maybe std::future<std::string> future = std::async(getAnswer); if (future.wait_for(timeout) == std::future_status::ready) answer = … Read more
If it exists, uint8_t must always have the same width as unsigned char. However, it need not be the same type; it may be a distinct extended integer type. It also need not have the same representation as unsigned char; for instance, the bits could be interpreted in the opposite order. This is a silly … Read more
template<typename> friend class foo this will however make all templates friends to each other. But I think this is what you want?
There is no way. You need a default constructor for array members and it will be called, afterwards, you can do any initialization you want in the constructor.
I found the -include option. Does this what you want? -include file Process file as if “#include “file”” appeared as the first line of the primary source file. However, the first directory searched for file is the preprocessor’s working directory instead of the directory containing the main source file. If not found there, it is … Read more
The only place where it really makes a difference is in templates in derived classes: template<typename T> class A { protected: T x; }; template<typename T> class B : A<T> { public: T get() { return this->x; } }; Due to details in the name lookup in C++ compilers, it has to be made explicitly … Read more