I’ve been using the new auto keyword available in the C++11 standard for complicated templated types which is what I believe it was designed for. But I’m also using it for things like: auto foo = std::make_shared<Foo>(); And more skeptically for: auto foo = bla(); // where bla() return a shared_ptr<Foo> I haven’t seen much … Read more
If I have a variable inside a function (say, a large array), does it make sense to declare it both static and constexpr? constexpr guarantees that the array is created at compile time, so would the static be useless? void f() { static constexpr int x [] = { // a few thousand elements }; … Read more
As far as I understand, the introduction of override keyword in C++11 is nothing more than a check to make sure that the function being implemented is the overrideing of a virtual function in the base class. Is that it? 6 Answers 6
In C++11, is there a way to template a lambda function? Or is it inherently too specific to be templated? I understand that I can define a classic templated class/functor instead, but the question is more like: does the language allow templating lambda functions? 12 Answers 12
Came across a proposal called “rvalue reference for *this” in clang’s C++11 status page. I’ve read quite a bit about rvalue references and understood them, but I don’t think I know about this. I also couldn’t find much resources on the web using the terms. There’s a link to the proposal paper on the page: … Read more
What is wrong with this program? #include <memory> #include <vector> int main() { std::vector<std::unique_ptr<int>> vec; int x(1); std::unique_ptr<int> ptr2x(&x); vec.push_back(ptr2x); //This tiny command has a vicious error. return 0; } The error: In file included from c:\mingw\bin\../lib/gcc/mingw32/4.5.0/include/c++/mingw32/bits/c++allocator.h:34:0, from c:\mingw\bin\../lib/gcc/mingw32/4.5.0/include/c++/bits/allocator.h:48, from c:\mingw\bin\../lib/gcc/mingw32/4.5.0/include/c++/memory:64, from main.cpp:6: c:\mingw\bin\../lib/gcc/mingw32/4.5.0/include/c++/bits/unique_ptr.h: In member function ‘void __gnu_cxx::new_allocator<_Tp>::construct(_Tp*, const _Tp&) [with _Tp = std::unique_ptr<int>, … Read more
I’ve seen default used next to function declarations in a class. What does it do? class C { C(const C&) = default; C(C&&) = default; C& operator=(const C&) & = default; C& operator=(C&&) & = default; virtual ~C() { } }; 5 Answers 5
I am making a small vocabulary remembering program where words would would be flashed at me randomly for meanings. I want to use standard C++ library as Bjarne Stroustroup tells us, but I have encountered a seemingly strange problem right out of the gate. I want to change a long integer into std::string so as … Read more
Reading some examples of range based loops they suggest two main ways 1, 2, 3, 4 std::vector<MyClass> vec; for (auto &x : vec) { // x is a reference to an item of vec // We can change vec’s items by changing x } or for (auto x : vec) { // Value of x … Read more
This question already has answers here: Is the ‘override’ keyword just a check for a overridden virtual method? (6 answers) Closed 8 years ago. The community reviewed whether to reopen this question 5 months ago and left it closed: Original close reason(s) were not resolved I am a beginner in C++. I have come across … Read more
