logo
down
shadow

static member initialization for specialized template class


static member initialization for specialized template class

By : user3849643
Date : October 22 2020, 11:12 AM
it fixes the issue For static member specializations, if you don't initialize the member, it is taken as a specialization declaration, that just says "Oh, don't instantiate the member from the primary template, because there is a specialized definition somewhere else". It should be mentioned that the definition should appear in a .cpp file (otherwise, you will earn the opposite: multiple definitions), and the declaration without initializer should still be placed in the header file.
Now the correct syntax is indeed the following, and it should not appear in a header file, but in a .cpp file
code :


Share : facebook icon twitter icon
Static member initialization in a class template

Static member initialization in a class template


By : Nayak
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I'd like to do this: , Just define it in the header:
code :
template <typename T>
struct S
{
    static double something_relevant;
};

template <typename T>
double S<T>::something_relevant = 1.5;
Initialize an static member in an fully specialized class template

Initialize an static member in an fully specialized class template


By : user2832236
Date : March 29 2020, 07:55 AM
wish helps you Don't use template<> while defining Value because template<> is not allowed in member definition of explicitly specialized class[X in this case]. Moreover you are missing a semicolon after }
This works for me:
code :
template<typename Type>
class X
{
};

template<>
class X<int>
{                                       
    public:

    static int Value;   
};

int X<int>::Value = 0;
Workaround for specialized template for member function, when template class is not specialized

Workaround for specialized template for member function, when template class is not specialized


By : user3000288
Date : March 29 2020, 07:55 AM
around this issue Function templates cannot be specialized in C++, point.
It does not matter whether they are members of template or not, specialization of function templates is not allowed. Normally when using argument types to infer the template arguments, overloading does the same specialization would, so specialization for functions (and the associated extra complexity in overload resolution and such) was not deemed necessary.
code :
DataStructure::DerivedIterator1 i = dataStructure.Begin();
DataStructure::DerivedIterator1 i = dataStructure.Begin<DataStructure::DerivedIterator1>();
DataStructure::DerivedIterator1 i = dataStructure.BeginIterator1();
class DataStructure {
    ...
    class BeginIteratorConstructor {
        DataStructure &dataStructure;
    public:
        BeginIteratorConstructor(DataStructure &ds) : dataStructure(ds) {}
        operator DerivedIterator1() { return dataStructure.BeginIterator1(); }
        operator DerivedIterator2() { return dataStructure.BeginIterator2(); }
    };
    BeginIteratorConstructor Begin() { return BeginIteratorConstructor(*this); }
    ...
};
initialization of static member of template class

initialization of static member of template class


By : Kaan
Date : March 29 2020, 07:55 AM
may help you . According to the C++ Standard (8.5 Initializers)
...If a program calls for the default initialization of an object of a const-qualified type T, T shall be a class type with a user-provided default constructor.
Static member initialization in a template class

Static member initialization in a template class


By : Adam Kangas
Date : March 29 2020, 07:55 AM
To fix the issue you can do I need to initialize a static bool inside of a template class and I tried to do it like this. The only difference I can see is that I have a constraint on type parameter T but this causes a compilation error, why? How can I solve this? , Maybe simpler
code :
template<class T, class V>
bool fraction<T, V>::auto_reduce = true;
template<class T, class = typename enable_if<is_any_integral<T>::value>::type>
class fraction
Related Posts Related Posts :
  • How to use priority_queue with a non-static compare method of class instance?
  • Template parameters inside and outside class/struct
  • Determining prime number
  • How to resolve ambiguity between constructors taking std::string and std::vector
  • My program crashes when I try to change private values from an object
  • Unordered_map with custom class as key
  • Strict aliasing rules broken with templates and inheritance
  • C++ Derived Class Override Return Type
  • singly linked list c++ constructor, destructor and printing out
  • How to clone class with vector of unique_ptr to base class
  • error: no match for operator
  • std::vector doesnt accept my struct as template
  • selection of people's contours
  • how to fix the (Error using mexOpenCV) on matlab?
  • Is or was there a proposal for c++ to use the context for short enum values?
  • Fair assumptions about std::hash implementations
  • undefined reference to libusb using cyusb
  • Function returns null pointer instead of address
  • C++17 copy elision and object destruction
  • Input multiple strings via operator>> c++
  • Avoiding overflow boost container
  • How to Write a Lambda Wrapping a Function with Optional Return Value
  • Partial specialization with more template parameters
  • How to convert fixed size array to pointer on pointer array
  • Memory leak in const member constructor with tag dispatching
  • C++ function with a generic and optional class
  • Custom QGraphicsItem That Contains Child QGraphicsItems
  • Are There Restrictions on What can be Passed to auto Template Parameters?
  • Rotating line inside rectangle bounds
  • Why do I need dynamic memory allocation if I can just create an array?
  • How can I convert a text file into a form that MPI_Bcast can send?
  • How to get array of all `this` of an instance
  • Using pointers as parameters
  • Automatic type deduction with const_cast is not working
  • Why does std::is_rvalue_reference not do what it is advertised to do?
  • Function Template Specialization with Forward Declared Type
  • template deduction failed in vector
  • Is there a signed `sizeof` alternative in Qt
  • clarification on overloading the -> operator
  • What is __m128d?
  • QtConcurrent: why releaseThread and reserveThread cause deadlock?
  • Function receiving different value than passed
  • Can C++ close a '''fstream''' variable after '''.close()'''?
  • Is it necessary to overload operator in this specific case
  • Comparing an element of a string array with a string
  • how to dereference a pointer of a map of pointers to objects in c++
  • How recursive function control flow change for static variable?
  • SDL 2 blitting BMP File
  • Why does an extremely large value cause this code to repeat infinitely?
  • Function returning different value than what is in function body before return statement
  • Struggling with including Headers in another header file (C++)
  • WebViewProcessControl initialization crash
  • C++ exception 0xC00000FD: Stack overflow (parameters: 0x00000001, 0x00C02F30)
  • What's difference between forward and move in the constructor of class?
  • C++: Is it possible to condense `bool` objects within the same byte?
  • I cant understand this access modifier
  • Boost Spirit X3: Collapsing one-element lists
  • How can I add a char to an istringstream?
  • Wrapping variadic templates in pybind11
  • C++ referencing instances created within a function's scope
  • shadow
    Privacy Policy - Terms - Contact Us © bighow.org