c++ argument list for class template is missing

When you encounter the error message "argument list for class template is missing" in C++, it means that you are trying to instantiate a class template without providing the necessary template arguments. Class templates in C++ are parameterized types, meaning they require template arguments to define the types used within the template.

To resolve this error, you need to provide the appropriate template arguments when instantiating the class template. Here are the steps to do so:

1. Identify the class template: Look for the class declaration or definition that includes the template keyword and angle brackets. For example:

template <typename T>
class MyClass {
    // class members
};

1. Determine the required template arguments: Examine the class template to identify the required template arguments. In the example above, the template argument is T.

2. Instantiate the class template: To create an object of the class template, you need to provide the template arguments within the angle brackets. For example:

MyClass<int> obj; // Instantiate MyClass with int as the template argument

1. Verify template arguments match the requirements: Ensure that the provided template arguments match the expected types or constraints specified by the class template. If the template argument is not valid, you may encounter additional compilation errors or warnings.

By following these steps, you should be able to resolve the "argument list for class template is missing" error by providing the necessary template arguments when instantiating the class template.