entt | Gaming meets modern C++ - a fast and reliable entity | Game Engine library
kandi X-RAY | entt Summary
kandi X-RAY | entt Summary
The entity-component-system (also known as ECS) is an architectural pattern used mostly in game development. For further details:.
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QUESTION
I'm writting a thin wrapper over a class from a third-party library.
My code looks like this:
...ANSWER
Answered 2022-Feb-22 at 06:34You don't declare a class template, but something like partial specilization. The correct way should be
QUESTION
Suppose that I have a Foo
class like this, and I need many instances of it.
ANSWER
Answered 2021-Aug-05 at 10:10While writing a mockup, with the idea of n. 1.8e9-where's-my-share m., for your "complicated registry pool" I wrote the actual could be implementation of Foo
. I left in there Foo
only to also give some suggestions. If you want so have more than one variable of one type you would have to change the value type of the map of course, like from std::any
to std::vector
. Otherwise please clarify your question more.
QUESTION
Hello I am beginner in Android NDK programming and I need some help getting freetype library to work with my project. I've been trying for 3 hours straight to somehow import freetype to my Android Studio project. I searched on the internet and could not find any solution that was working. I downloaded the library and put it in my cpp folder of the project.But I don't know how to include freetype. Any help would be appreaciated!
This is how my CMakeLists.txt look and for the files that I have added it works for them:
...ANSWER
Answered 2021-May-21 at 19:31Ok the solution was very simple. All I did actually was I created directory in cpp folder named freetype and in that dir I've put every freetype file and just added that folder as sub directory in CMake and linked at the end and now eveyrthing works. Here is my CMake:
QUESTION
I am attempting to create a std::vector
class member that stores multiple systems that all derive from SystemBase
. However this class has a reference and thus has no sensible default constructor:
ANSWER
Answered 2021-May-09 at 02:55In C++, variables and objects of type X are actually objects of type X. They are never objects of a derived type.
Pointers to base can point at derived. Derived objects have a base class subobject in them. But a vector of foo contains actual foos.
In many C++ derived languages, variables of object type are actually pointers (often called references) to said objects. This often leads to primitive types having value semantics, while object types have reference or pointer semantics.
A vector of unique ptrs, meanwhile, can store pointers to base that point to derived.
QUESTION
A library I'm using requires that classes used with its templates are move constructible and assignable, for various internal reasons. I've written a class, and given it an explicit move constructor.
...ANSWER
Answered 2020-Jul-25 at 23:35is_move_constructible
is based on the behavior of is_constructibe
; it's just is_constructible
. And is_constructible
requires that you can do this:
QUESTION
The EnTT library API allows you to arbitrarily assign and retrieve "pools" of different types using some metaprogramming.
How does the below code produce a unique integer for different base types. It's disregarding constantness and references which I'm also finding difficult to understand.
Runnable exampleI have extracted the logic from the EnTT. You will need a C++17 compiler:
...ANSWER
Answered 2020-Feb-08 at 22:19With a lot of extra machinery to deal with various edge cases the code is essentially doing something like this:
QUESTION
I'm following https://github.com/skypjack/entt/wiki/Crash-Course:-cooperative-scheduler to evaluate EnTT library 3.2.2
Using VS2019 Community edition. It fails to compile.
...ANSWER
Answered 2020-Jan-18 at 22:15The static assert that is failing is this one:
QUESTION
In general, how would you request vector
as a type in a template?
ANSWER
Answered 2020-Jan-04 at 02:26C++ (at least C++17) does not support template parameter constraints like C# does (they were proposed for C++0x as "concepts" but withdrawn). But you can have a static assert using std::is_base_of
.
And as a hint to whoever consumes your library, I'd name the template parameter as TVector
and TVectorItem
to be clear that it expects a vector
derivative.
(And I agree with the (now deleted) comment that the Service Locator pattern is an anti-pattern. There are almost always better alternatives to using the Service Locator pattern - but we'd need to know more about your application before suggesting anything).
(And if you're using Visual Studio or MSBuild and want to build a statically-evaluated or constexpr
DI container builder, consider using T4 for codegen instead of C++ templates).
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