python (65.1k questions)

javascript (44.2k questions)

reactjs (22.7k questions)

java (20.8k questions)

c# (17.4k questions)

html (16.3k questions)

r (13.7k questions)

android (12.9k questions)

Questions - c++-standard-library

What is the design purpose of iterator_traits?

The C++ standard library has both iterator and iterator_traits templates defined. It seemed that in general, the iterator_traits just extracts properties that defined explicitly in iterator. If a iter...
test-img

user3059627

c++

templates

c++-standard-library

Votes: 0

Answers: 1

Latest Answer

It seemed that in general, the iterator_traits just extracts properties that defined explicitly in iterator. If a iterator_traits is to be used, one can use the corresponding iterator directly. Not ...
test-img

eerorika

Why are standard library types accessible inside `std` despite being nested in implementation-defined namespaces?

I was browsing the implementation of the <optional> header for GCC 11.2 (which can be found here), and I noticed something I'm struggling to understand. Here's the header with (hopefully) only t...
test-img

md1357

c++

namespaces

language-lawyer

c++20

c++-standard-library

Votes: 0

Answers: 1

Latest Answer

The c++config in libstdc++ that defines these macros also initially declares the version namespace as inline here: // Defined if inline namespaces are used for versioning. #define _GLIBCXX_INLINE_VERS...
test-img

Barry

Inbuilt / pre-defined comparator in cpp

Recently I learnt about comparators in cpp from STL. I came to know we can use greater<>() as third argument for sorting instead of writing own logic. Just curious to know how many inbuilt compa...
test-img

NITHISH

c++

comparator

c++-standard-library

Votes: 0

Answers: 1

Latest Answer

The standard library defines pretty much what you would expect as analogues to the built-in operators: std::equal_to // == std::not_equal_to // != std::less // < std::less_equal /...
test-img

user17732522

How should I use a queue with an unordered_set as the underlying container

I have a data structure containing a set of std::pair<int, int>. There are two important properties I require for this data structure: I can check set membership fast. FIFO So as a C++ beginne...
test-img

Alexander Soare

c++

stl

c++-standard-library

Votes: 0

Answers: 1

Latest Answer

The queue adaptor requires an ordered container such as deque or list to work. In my opinion, it is also obsolete as it only removes functionality from the underlying container and doesn't add anythin...
test-img

Homer512

Posts

Questions

Blogs

Jobs