c++11 Archives - Page 4 of 11

Why is conversion from string constant to ‘char*’ valid in C but invalid in C++

The C++11 Standard (ISO/IEC 14882:2011) says in § C.1.1: char* p = "abc"; // valid in C, invalid in C++ For the C++ ...

May 25, 2022
0 Comments

What breaking changes are introduced in C++11?

I know that at least one of the changes in C++11 that will cause some old code to stop compiling: the introduction of ...

May 25, 2022
0 Comments

What is the correct way of using C++11’s range-based for?

What is the correct way of using C++11’s range-based for? What syntax should be used? for (auto elem : container), or for (auto& ...

May 25, 2022
0 Comments

What is std::decay and when it should be used?

What are the reasons for the existence of std::decay? In what situations is std::decay useful? 2 Answers 2

May 24, 2022
0 Comments

How to remove from a map while iterating it?

How do I remove from a map while iterating it? like: std::map<K, V> map; for(auto i : map) if(needs_removing(i)) // remove it from ...

May 24, 2022
0 Comments

std::vector performance regression when enabling C++11

I have found an interesting performance regression in a small C++ snippet, when I enable C++11: #include <vector> struct Item { int a; ...

May 24, 2022
0 Comments

Which kind of pointer do I use when?

Ok, so the last time I wrote C++ for a living, std::auto_ptr was all the std lib had available, and boost::shared_ptr was all ...

May 24, 2022
0 Comments

Can the use of C++11’s ‘auto’ improve performance?

I can see why the auto type in C++11 improves correctness and maintainability. I’ve read that it can also improve performance (Almost Always ...

May 24, 2022
0 Comments

What exactly is std::atomic?

I understand that std::atomic<> is an atomic object. But atomic to what extent? To my understanding an operation can be atomic. What exactly ...

May 24, 2022
0 Comments

Is it possible to use std::string in a constexpr?

Using C++11, Ubuntu 14.04, GCC default toolchain. This code fails: constexpr std::string constString = "constString"; error: the type ‘const string {aka const std::basic_string}’ ...

May 23, 2022
0 Comments