CodeBlocks namespace problem

[JustinPlusPlus]

Hello, I have been learning namespaces in classes using CodeBlocks IDE and I have encountered a problem. Whenever I want to create 2 classes with identical names and separate them using namespaces, the first namespace works perfectly but when I try to use the second one it says that "the "namespace name" does not name a type". I would appreciate help. Thanks.

P.S. I have headers and cpp's in separate files, but i will paste code as one here.

// Main file  

#include <iostream>
#include "lesson.h"
#include "lesson_t.h"

int main()
{
    one::lesson a;
    one::a.print();


    two::lesson a;

    two::a.print();

    return 0;
}

// End of main

// Start of "lesson.h header"

#ifndef LESSON_H
#define LESSON_H


namespace one{

class lesson
{
    public:
        lesson();
        virtual ~lesson();
        void print();

    protected:

    private:
};

}

#endif // LESSON_H


// End of "lesson.h header"


//Start of "lesson.cpp"

#include "lesson.h"
#include <iostream>

namespace one{

lesson::lesson()
{
    //ctor
}

lesson::~lesson()
{
    //dtor
}

void lesson::print(){

    std::cout<<"Text1"<<std::endl;
}

}


//End of "lesson.cpp"

//Start of "lesson_t.h" header

#ifndef LESSON_H
#define LESSON_H

namespace two {

class lesson
{
    public:
        lesson();
        virtual ~lesson();
        void print();

    protected:

    private:
};

}

#endif // LESSON_H


//End of "lesson_t.h" header

//Start of "lesson_t.cpp"

#include "lesson_t.h"
#include <iostream>

namespace two {

lesson::lesson()
{
    //ctor
}

lesson::~lesson()
{
    //dtor
}

void lesson::print(){

std::cout<<"Text2"<<std::endl;

}

}

//End of lesson_t.cpp"

[Handy Andy]

Hello JustinPlusPlus,

This is the first thing that jumps out at me when I look at your code:

//Start of "lesson_t.h" header

#ifndef LESSON_H  << --- Already defined in "lesson.h" file. Try using "LESSON2_H".
#define LESSON_H 

When line 3 is reached the "#ifndef" will see that "LESON_H" has already been defined and skip this bit of code.

I will load this up and see what else I can find.

Hope that helps for now,

Andy

[Handy Andy]

Hello JustinPlusPlus,

I loaded up the program in VS and as I thought using the same name for the include guards is a problem. When I looked at the "lesson_t" header file it was grayed out because "LESSON_H" was already defined. When I changed the name it worked fine.

The next problem is a simple one in main. The comments should explain it:

#include <iostream>
#include <limits>  // <--- Added.
#include "lesson.h"
#include "lesson_t.h"

int main()
{
	one::lesson a;  // <--- This is OK
	a.print();  // <--- a is already defined as being in the "one" name space and its type is lesson. The qualifier is not needed.

	two::lesson b;  // <--- Redefinition of "a" needs to be a different variable name.
	b.print();

	// This next line may not be needed. If you have to press Enter to see the prompt then comment out the
	// next line. If not you will need this to clear the input buffer first.
	//std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');  // <--- Requires heder file <limits>.
	std::cout << "\n\n Press Enter to continue";
	std::cin.get();

	return 0;
}

The lines just before return are need by some to keep the console window open at the end of the program.

Hope that helps,

Andy