std Archives - IT Nursery

C++, Programming

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How do I reverse a C++ vector?

Is there a built-in vector function in C++ to reverse a vector in place? Or do you just have to do it manually? ...

June 3, 2022
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C++, Programming

IT Nursery

printf with std::string?

My understanding is that string is a member of the std namespace, so why does the following occur? #include <iostream> int main() { ...

June 3, 2022
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C++, Programming

IT Nursery

Compelling examples of custom C++ allocators?

What are some really good reasons to ditch std::allocator in favor of a custom solution? Have you run across any situations where it ...

June 2, 2022
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Replace part of a string with another string

Is it possible in C++ to replace part of a string with another string? Basically, I would like to do this: QString string("hello ...

May 25, 2022
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cout is not a member of std

I’m practicing using mulitple files and header files etc. So I have this project which takes two numbers and then adds them. Pretty ...

May 24, 2022
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Can you remove elements from a std::list while iterating through it?

I’ve got code that looks like this: for (std::list<item*>::iterator i=items.begin();i!=items.end();i++) { bool isActive = (*i)->update(); //if (!isActive) // items.remove(*i); //else other_code_involving(*i); } items.remove_if(CheckItemNotActive); ...

May 19, 2022
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Why would I ever use push_back instead of emplace_back?

C++11 vectors have the new function emplace_back. Unlike push_back, which relies on compiler optimizations to avoid copies, emplace_back uses perfect forwarding to send ...

May 19, 2022
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What’s the difference between “STL” and “C++ Standard Library”?

Someone brought this article to my attention that claims (I’m paraphrasing) the STL term is misused to refer to the entire C++ Standard ...

May 4, 2022
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How to find out if an item is present in a std::vector?

All I want to do is to check whether an element exists in the vector or not, so I can deal with each ...

April 25, 2022
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Why is “using namespace std;” considered bad practice?

I’ve been told by others that writing using namespace std; in code is wrong, and that I should use std::cout and std::cin directly ...

April 10, 2022
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