Modern-C | Modern C of Jens Gustedt , code for challenge problems | Frontend Framework library
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of Jens Gustedt, code for challenge problems
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QUESTION
I'm following https://jeffreyfritz.com/2017/11/modern-configuration-for-asp-net-4-7-1-with-configurationbuilders/ for my ASP.NET 4.7.2 application but we have this in the Web.config:
I was hoping I could transiently set the values in myconfig.config using environment variables by changing this block to:
But this gives me a compiler error:
A section using 'configSource' may contain no other attributes or elements.
Here's what myconfig.config looks like:
...ANSWER
Answered 2021-Jun-07 at 22:56The solution, for anyone facing this, is to put the "configBuilders" attribute on the target file as so:
QUESTION
The compilator says:
"No callable 'begin' function found for type Array< int> * "
"No callable 'end' function found for type Array< int> * "
"it undeclared identifier"
In the print function, I try to iterate through my array of pointers using for(auto it: this). I followed this tutorial to create a custom iterator and I don't know what I did wrong. I'm not very sure if my iterator structure is defined correctly because in his example his using a simple array of integers and I have an array of pointers to a T type. My question is, what exactly should I edit to make the iterator working fine. I think I should edit some types from struct Iterator, but I'm not very sure what to edit. I use the auto keyword on the bottom, on the print function. Thanks in advice!
Full source code for my class is: Array.h
...ANSWER
Answered 2021-May-22 at 14:04Solved by changing some types from the structure. Because It is an array of pointers, it needs to have:
value_type should be a T* because every element from the array is a pointer
pointer should be a T** because it points to an array of pointers
and reference should be a T*& because is a reference through a pointer element from the array.
Also, with some help from MatG, the for(auto it: this) should be changed to for(auto it: *this), because we need to use the dereferenced value of this class. Please correct me if I'm wrong
QUESTION
I was reading Chapter 8 of the "Modern C++ Programming Cookbook, 2nd edition" on concurrency and stumbled upon something that puzzles me.
The author implements different versions of parallel map and reduce functions using std::thread and std::async. The implementations are really close; for example, the heart of the parallel_map functions are
ANSWER
Answered 2021-May-08 at 10:25My original interpretation was incorrect. Refer to @OznOg's answer below.
Modified Answer:
I created a simple benchmark that uses std::async and std::thread to do some tiny tasks:
QUESTION
Here is my code:
...ANSWER
Answered 2021-Apr-11 at 09:49How can I call this function with both class A and B?
Both std::shared_ptr and std::shared_ptr are convertible to std::shared_ptr, which is what your function expects, so providing a shared pointer will work.
QUESTION
i have a clone from a big app on my system, after i ran npm install, this is my log:
ANSWER
Answered 2021-Jan-08 at 17:37I think you need to download and install XCode
QUESTION
Many build systems (such as make) sometimes prompt the user to confirm his intention if large dependencies must be downloaded and installed from the internet to continue with the build process.
What is the best way to achieve this from CMake?
My example application. I'm adapting a CMakeLists.txt file that installs Google Test framework if it isn't found. How should I modify this to ask the user for permission before installing it?
Alternatively, perhaps this is not possible/standard and I should instead just require the user to pass a variable definition when calling CMake, to assert his consent to the download?
...ANSWER
Answered 2020-Dec-09 at 18:08Passing a variable to CMake is a proper way for specify an user decision.
Asking a user for confirm some default decision looks nice... but I fear CMake has no ready-to-use tools for that. Note, that configuration of the project could be requested both in shell/terminal (via cmake executable) and from CMake GUI, which is not connected with the user input.
Instead of asking the user for confirmation during the configuration process, you may fail configuration (e.g. with message(FATAL_ERROR)). But ship this fail with the message describing the variable a user needs to set.
QUESTION
In Effective Modern C++, Item 12, Scott Meyers writes the following class to show how useful overloading member functions on the reference qualifiers can be:
...ANSWER
Answered 2020-Nov-03 at 22:35values is an object member and an lvalue, so if you just return values directly, it will be copied to the return value, not moved. The point of the && ref-qualified overload is to avoid making an unnecessary copy. return std::move(values) accomplishes this by casting values to an rvalue, so that it gets moved from instead of copied.
For the second part of your question: both have their advantages and disadvantages. As the answer you linked notes, returning by value from the && overload avoids lifetime issues, since the returned object will have its lifetime extended if a reference is immediately bound to it. On the other hand, returning by value could destroy the value of values unexpectedly. For instance:
QUESTION
Suppose the class Object satisfies the requirements of MoveConstructible and MoveAssignable, but not the requirements of either CopyConstructible or CopyAssignable (i.e. PIMPL with unique_ptr within). Then I have two consumers:
ANSWER
Answered 2020-Nov-03 at 19:53As you have written it, when 1 returns false, then arg is still in a valid state so there's nothing wrong with your code (and even if it wasn't, still there would be nothing wrong).
QUESTION
I have built a website to React. My code is here https://codesandbox.io/s/3d-tool-zjm5m?file=/src/components/modeling.jsx. What I want is when the user clicks on the button "Go upload" in Modeling tab, it will link to a new page of upload.jsx with still have the navigation bar.
App.js code:
...ANSWER
Answered 2020-Oct-22 at 23:39Your navigation bar has hashlinks to sections on what amounts to a "homepage". When you introduce app navigation and want more than a single page then you should use Link components versus anchor tags. You also need to place the Navigation component on a route so it has access to the Router context.
Since you already wrap the entire app in a Router you need only place the Navigation and "homepage" components in Routes. Render the "homepage" components into an anonymous component and remember to pass the route props through to each component.
QUESTION
I am using Recharts to render four area charts in my react project. I have a separate file to render one area chart and then I export it to my main component to be rendered four times with different gradient backgrounds. Here is how I drew my chart :
...ANSWER
Answered 2020-Oct-12 at 16:00the problem is in the id of gradient definition: id="colorUv", you should pass the id in the props to have a dynamic gradient definition. You should do like this :
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