Member declaration is a variable that is associated with a specific object and is accessible for all other member functions. The error occurs if a variable that does not belong to the class of variables is used as a member of the function.
Cause
The compiler has a standard text like a template that it uses in its internal buffer and thus errors are detected when the compiler parses the template and detects the error.
Template declarations have different meanings depending on the arguments used in their development. The expressions used may have different types of values that give variables different types or functions calls for different functions; such depend majorly on template parameters.
The standards separate the construct into groups depending on dependency level:
Dependent types such as a parameter (T)
Value-dependent expressions like non-type parameter (N)
Type-dependent expressions that are cast to a type template parameter (T) 0
The use of declarations in C++ also includes “typename” which means that a name can be looked up if the template arguments/parameters are known.
Under all circumstances of programming, the template’s arguments must be fulfilled else qualified name not allowed error is will display. Read Solution
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