How to avoid std namespace in header!.

[shafiul0304034]

Is there any way to avoid the std namespace in the header?.

#ifndef ADDTUPLE_H
#define ADDTUPLE_H
#include <tuple>

class AddTuple {
	public:
		std::tuple<double, char> get_student(int);
};
#endif


#include "AddTuple.h"
#include <iostream>
#include <stdexcept>
std::tuple<double, char> AddTuple :: get_student(int id)
{
	if (id == 0) return std::make_tuple(3.8, 'A');
	if (id == 1) return std::make_tuple(2.9, 'C');
	if (id == 2) return std::make_tuple(1.7, 'D');
	throw std::invalid_argument("id");
}

int main()
{
	double gpa1;
	char grade1;
	std::string name1;
	AddTuple addTpp;
	std::tie(gpa1, grade1) = addTpp.get_student(1);
	std::cout << "ID: 1, "
		<< "GPA: " << gpa1 << ", "
		<< "grade: " << grade1 << '\n';
	return 0;
}

[lastchance]

Well, if you want to avoid std:: (not sure why you want to do that?) then create a struct with elements of type double and char and refer to that instead.

If you use tuple then you are referring to something in the std:: namespace so "std" is going to appear somehow.

[Ganado]

I think you're misunderstanding the guideline, sort of like a game of "telephone".

The guideline is, don't use "using namespace X;" in the global scope of a header file, because it pollutes the global namespace for anyone using the header.

[shafiul0304034]

Thanks Ganado and lastchance,
Well, Generally in the header file, it is not recommend to use a namespace. But I understood Ganado's explanation. Thanks.

[jlb]

Well, Generally in the header file, it is not recommend to use a namespace.

No it is perfectly acceptable to use namespaces in header files, however using "using" statements in the global namespace in a header is considered a bad practice.

[shafiul0304034]

Thanks jlb