A beginner's question, but how do I thread?
I have this code snippet:
std::vector<std::thread*> threads[8];
for (unsigned short rowIndex = 0; rowIndex < unimportantStuff.rows; ++rowIndex)
{
for (unsigned short columnIndex = 0; columnIndex < unimportantStuff.columns; ++columnIndex)
{
myModelInstance = new CModelInstance;
myModelInstance->Init(myLoader.CreateTriangle(myFramework.myDevice, { -0.8f + unimportantStuff.offset*columnIndex, -0.8f + unimportantStuff.offset*rowIndex }), { -0.8f + unimportantStuff.offset*columnIndex, -0.8f + unimportantStuff.offset*rowIndex });
myScene.AddModelInstance(myModelInstance);
}
}
I want to thread both the Init function and the AddModelInstance function if possible, however I don't know how to continue. How do I activate multiple threads (up to 8 in this case)?
I tried with a single thread like this:
std::thread t1(myScene.AddModelInstance, myModelInstance);
But I get the following error:
CScene::AddModelInstance': non-standard syntax; use '&' to create a pointer to member
I tried adding & to both the function and the argument, but neither worked.
Instead of this:
std::thread t1(myScene.AddModelInstance, myModelInstance);
You need something like this:
std::thread t1(&Scene::AddModelInstance, myScene, myModelInstance);
&Scene::AddModelInstance
is a pointer to the member function you want to call, which presumably takes an implicit this
parameter ( myScene
).
假设myScene
属于Scene
类型,请尝试以下操作:
std::thread t1(&Scene::AddModelInstance, &myScene, myModelInstance);
A clean and intuitive way is to use lambda expressions
std::thread t1([&]() mutable {myScene.AddModelInstance(myModelInstance);});
Do take note about capturing by reference or value
As a side note, make sure you have no data races in your program
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