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how to create template class in another class with out default constructor

开发者 https://www.devze.com 2023-03-25 19:03 出处:网络
I have the following template class template <typename threadFuncParamT > class ThreadPool { // number of threads to be launced initially and added to thread pool.

I have the following template class

template <typename threadFuncParamT >
class ThreadPool
{
    // number of threads to be launced initially and added to thread pool.
    ThreadPool( pThreadFunc pFunction, RtsInt16_t minThreads, RtsInt16_t maxThreads, Rts开发者_如何转开发Int16_t maxExecCount);
};

Now i want to use object of another class

struct myStruct 
    //...
};

class MyClass 
{
private:

    ThreadPool<myStruct *> pool;
};

My question is how to create ThreadPool with constructor arguments in MyClass constructor as I don't have default constructor?


Assuming you mean "as I don't have default constructor in ThreadPool:

MyClass::MyClass()
 : pool( &thrdFunc, 7, 42, 12 )
{
}

Assuming you mean "as I don't have default constructor in MyClass:

MyClass has a default constructor as long as you either provide your own or you do not provide any other constructor. As it is in your question, it has a compiler-generated default constructor. Of course, that wouldn't compile, because the compiler-generated default constructor would simply call the default constructors of all (base classes and) data members, and the only data member pool is of a class that doesn't provide a default constructor.
So you need to provide your own default constructor, as shown in the example above.


Like any other member -- this is not specific to template instantiation types -- in the initializer list for the constructors of MyClass. For instance for the default constructor:.

MyClass::MyClass()
   : pool(myFunction, myMinThread, myMaxThread, myExeCount)
{}
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