String in the method arguments

[DANIEL 602]

I guess the simplest solution is to add a "# include <string>" and remove "class std:: string, but I do not want to do to avoid multiple inclusion of file in files which will include this header and <string>. I hope that someone will be able to help me!
Here is the code of the header of my class:

/ / Zip.h

 class ifstream;
 class std:: string;

 using namespace std;

 class Zip (
     private:
         / / Ifstream * m_file;

     public:
         Zip (string name) 
         ~ Zip ();
 );

[kelfro]

Both include std:: string, especially since your argument fails if a file has already been included it will not be a second time in the same source file (otherwise you would have errors of multiple definitions). But good if you really want to avoid:

 namespace std
 (
     class string;
 )

 class Zip
 (
 public:

     Zip (const std:: string & name);
 );

[Zecho]

Objective-C is a reflective, object-oriented programming language, which adds Smalltalk-style messaging to the C programming language. It is a reasonable policy for a class to skip validating arguments of private methods.

[Katty]

# include <iosfwd>
 # include <xmemory>

 namespace std
 (
     template <typename, typename, typename> class basic_string;
 )

 class Zip
 (
 public:

     Zip (const std:: basic_string <char, std:: char_traits <char>, std:: allocator <char>> & name);
 );