Sign Up

Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.

Have an account? Sign In

Have an account? Sign In Now

Sign In

Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.

Sign Up Here

Forgot Password?

Don't have account, Sign Up Here

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Have an account? Sign In Now

You must login to ask a question.

Forgot Password?

Need An Account, Sign Up Here

Please briefly explain why you feel this question should be reported.

Please briefly explain why you feel this answer should be reported.

Please briefly explain why you feel this user should be reported.

Sign InSign Up

The Archive Base

The Archive Base Logo The Archive Base Logo

The Archive Base Navigation

  • Home
  • SEARCH
  • About Us
  • Blog
  • Contact Us
Search
Ask A Question

Mobile menu

Close
Ask a Question
  • Home
  • Add group
  • Groups page
  • Feed
  • User Profile
  • Communities
  • Questions
    • New Questions
    • Trending Questions
    • Must read Questions
    • Hot Questions
  • Polls
  • Tags
  • Badges
  • Buy Points
  • Users
  • Help
  • Buy Theme
  • SEARCH
Home/ Questions/Q 100639
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Editorial Team
Asked: May 11, 20262026-05-11T00:37:05+00:00 2026-05-11T00:37:05+00:00

I have a vector with 1000 nodes if(count + 1 > m_listItems.capacity()) m_listItems.reserve(count +

  • 0

I have a vector with 1000 ‘nodes’

 if(count + 1 > m_listItems.capacity())      m_listItems.reserve(count + 100); 

The problem is I also clear it out when I’m about to refill it.

m_listItems.clear(); 

The capacity doesn’t change. I’ve used the resize(1); but that doesn’t seem to alter the capacity. So how does one change the reserve?

  • 1 1 Answer
  • 1 View
  • 0 Followers
  • 0
Share
  • Facebook
  • Report

Leave an answer
Cancel reply

You must login to add an answer.

Forgot Password?

Need An Account, Sign Up Here

1 Answer

  • Voted
  • Oldest
  • Recent
  • Random
  1. 2026-05-11T00:37:06+00:00Added an answer on May 11, 2026 at 12:37 am
    vector<Item>(m_listItems).swap(m_listItems); 

    will shrink m_listItems again: http://www.gotw.ca/gotw/054.htm (Herb Sutter)

    If you want to clear it anyway, swap with an empty vector:

    vector<Item>().swap(m_listItems); 

    which of course is way more efficient. (Note that swapping vectors basicially means just swapping two pointers. Nothing really time consuming going on)

    • 0
    • Reply
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
      • Report

Sidebar

Related Questions

I have the vector d<-1:100 I want to sample k=3 times from this vector
I have a vector of objects (objects are term nodes that amongst other fields
I have a vector of pairs representing hops between nodes which I would like
Say I have a vector with 1000 values and I want to 'split/partition/group' this
I have written some C++ code that generates a std::vector. I also have a
Is there a well-known solution to the following problem? You have a vector of
I have vector< pair<int, int>> myVec (N); I want to have all pairs initialized
in clojure i have vector [myfn1 myfn2 myfn3] how can i call functions named
I have a vector class and I defined the __mul__ method to multiply a
I have a vector where I keep an incrementing data. Normally each element of

Explore

  • Home
  • Add group
  • Groups page
  • Communities
  • Questions
    • New Questions
    • Trending Questions
    • Must read Questions
    • Hot Questions
  • Polls
  • Tags
  • Badges
  • Users
  • Help
  • SEARCH

Footer

© 2021 The Archive Base. All Rights Reserved
With Love by The Archive Base

Insert/edit link

Enter the destination URL

Or link to existing content

    No search term specified. Showing recent items. Search or use up and down arrow keys to select an item.