How Can I Create a Parameterless Template Constructor in C ?

Constructor Templates Without Parameters

In C , it is not possible to directly declare a template constructor with no parameters. This is because conflict arises with the default constructor.

One possible workaround is to create a dummy parameter in the template constructor:

class A{
   template <typename U> A(U* dummy) {
       // Do something
   }
};

Limitations of the Workaround

However, this workaround has limitations:

• The template arguments cannot be explicitly specified when calling the constructor, as they must be deduced through argument deduction.
• You still need to pass an argument in order to invoke the constructor template.

Alternative Approaches

To achieve the desired functionality without these drawbacks, consider the following alternatives:

• Using default values in the class constructor: Define a default constructor with default values for the desired parameters.
• Using factory functions: Create static factory functions that accept the desired arguments and return instances of the class.

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