8 ms·

C++ was one of the first languages I learnt as an undergrad, maybe 20 years ago. I used it for a few hobby projects but not much else (professionally these days

C++ was one of the first languages I learnt as an undergrad, maybe 20 years ago. I used it for a few hobby projects but not much else (professionally these days I mainly use Typescript & Go). I'd love to pick up C++ again but I've found it really challenging to discover what I should read up on to know what modern C++ should look like. What's a great resource for someone who's been out of C++ for a couple of decades to pick up and learn today's idiomatic C++? I don't want Rust btw - it's a great language but I want to revitalise my C++ knowledge, not jump ship entirely.

detaro 4y ago
The standard recommendations to come to up speed up to ~C++14 are Scott Meyers books, Effective C++ and Effective Modern C++, but I'm not sure if they work well alone when you've not used C++ in a long time. And don't have a good recommendation for something covering the stuff newer than that.
raegis 4y ago
I think Jonathan Boccara's talk, "105 STL Algorithms in Less Than an Hour" ( https://www.youtube.com/watch?v=2olsGf6JIkU https://www.youtube.com/watch?v=2olsGf6JIkU ), gives a nice overview of the <algorithm> library. Also, the examples on the reference pages (usually near the bottom) at cppreference.com are usually pretty good. For example: Here's how to create a pseudo random number generator using the Mersenne Twister engine. std::mt19937 e; // Mersenne Twister engine std::uniform_int_distribution<int> u(0,99999); // uniform ints 0 to 99999, inclusive auto rng = std::bind(u,e); // so rng() retuns the next random number And filling a vector with random numbers could look like this: std::vector<int> nums(1000); std::generate(nums.begin(), nums.end(), rng); This last line can be written in C++20 more simply like this: std::ranges::generate(nums,rng);
- cyber_kinetist 4y ago
  Why should I do this, when I can just write: for (int i = 0; i < nums.size(); i++) { nums[i] = rng(); } Simple, easy to understand, actually compiles to efficient code even in Debug mode, don't need to include <algorithm> header which includes 10000+ lines of STL code which bloats compile times, etc.
  - tsimionescu 4y ago
    Even better, so you can't accidentally move out of bounds: for (int i : nums) { nums[i] = rng(); } Edit: Ooops, I'm an idiot, this doesn't do anything useful (i is every value in nums, not the indices of nums...)
    - leshow 4y ago
      Doesn't that not work because `nums` is all initialized to 0 though? Like, wouldn't it be for (int num : nums) { num = rng(); } (I don't know any c++). I kind of expect the above not to work though because it's doing an assignment. I suppose this is a good argument to just use a `fill` or `generate` function...
      - tsimionescu 4y ago
        You're right, I completely forgot what it meant... The loop I wrote was basically equivalent to : for (int i = 0; i < nums.size(); ++i) { nums[nums[i]] = rng(); } Which happens not to go out of bounds simply because nums[i] is initially 0 for every i in the range - so it sets nums[0] to a different random number 1000 times.
ncmncm 4y ago
Generally Cppreference.com has the most authoritative information on what C++ is now. It is somewhat opinionated about modernity, but not enough so to be intrusive. Usage examples have often been updated to current best practice.
rramadass 4y ago
* Discovering Modern C++ by Peter Gottschling - Good fast coverage of the features. * The C++ Programming Language, 4th edition by Bjarne Stroustrup - The biggest change in the language was the introduction of C++11 and this book covers it well. * A Tour of C++, 3rd edition by Bjarne Stroustrup - Summary of all changes upto C++20. * Software Architecture with C++: Design modern systems using effective architecture concepts, design patterns, and techniques with C++20 by Adrian Ostrowski et.al. - More like a broad survey rather than in-depth but covers development in a "modern ecosystem". * Modern C++ Programming Cookbook: Master C++ core language and standard library features, with over 100 recipes, updated to C++20, 2nd Edition by Marius Bancila - A series of articles one each for a language feature.

detaro 4y ago

The standard recommendations to come to up speed up to ~C++14 are Scott Meyers books, Effective C++ and Effective Modern C++, but I'm not sure if they work well alone when you've not used C++ in a long time. And don't have a good recommendation for something covering the stuff newer than that.

raegis 4y ago

I think Jonathan Boccara's talk, "105 STL Algorithms in Less Than an Hour" ( https://www.youtube.com/watch?v=2olsGf6JIkU https://www.youtube.com/watch?v=2olsGf6JIkU ), gives a nice overview of the <algorithm> library. Also, the examples on the reference pages (usually near the bottom) at cppreference.com are usually pretty good. For example: Here's how to create a pseudo random number generator using the Mersenne Twister engine. std::mt19937 e; // Mersenne Twister engine std::uniform_int_distribution<int> u(0,99999); // uniform ints 0 to 99999, inclusive auto rng = std::bind(u,e); // so rng() retuns the next random number And filling a vector with random numbers could look like this: std::vector<int> nums(1000); std::generate(nums.begin(), nums.end(), rng); This last line can be written in C++20 more simply like this: std::ranges::generate(nums,rng);

cyber_kinetist 4y ago
Why should I do this, when I can just write: for (int i = 0; i < nums.size(); i++) { nums[i] = rng(); } Simple, easy to understand, actually compiles to efficient code even in Debug mode, don't need to include <algorithm> header which includes 10000+ lines of STL code which bloats compile times, etc.
- tsimionescu 4y ago
  Even better, so you can't accidentally move out of bounds: for (int i : nums) { nums[i] = rng(); } Edit: Ooops, I'm an idiot, this doesn't do anything useful (i is every value in nums, not the indices of nums...)
  - leshow 4y ago
    Doesn't that not work because `nums` is all initialized to 0 though? Like, wouldn't it be for (int num : nums) { num = rng(); } (I don't know any c++). I kind of expect the above not to work though because it's doing an assignment. I suppose this is a good argument to just use a `fill` or `generate` function...
    - tsimionescu 4y ago
      You're right, I completely forgot what it meant... The loop I wrote was basically equivalent to : for (int i = 0; i < nums.size(); ++i) { nums[nums[i]] = rng(); } Which happens not to go out of bounds simply because nums[i] is initially 0 for every i in the range - so it sets nums[0] to a different random number 1000 times.

ncmncm 4y ago

Generally Cppreference.com has the most authoritative information on what C++ is now. It is somewhat opinionated about modernity, but not enough so to be intrusive. Usage examples have often been updated to current best practice.

rramadass 4y ago

* Discovering Modern C++ by Peter Gottschling - Good fast coverage of the features. * The C++ Programming Language, 4th edition by Bjarne Stroustrup - The biggest change in the language was the introduction of C++11 and this book covers it well. * A Tour of C++, 3rd edition by Bjarne Stroustrup - Summary of all changes upto C++20. * Software Architecture with C++: Design modern systems using effective architecture concepts, design patterns, and techniques with C++20 by Adrian Ostrowski et.al. - More like a broad survey rather than in-depth but covers development in a "modern ecosystem". * Modern C++ Programming Cookbook: Master C++ core language and standard library features, with over 100 recipes, updated to C++20, 2nd Edition by Marius Bancila - A series of articles one each for a language feature.