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public: __thiscall String::String(char const *)

 

public: __thiscall String::String(char const *), I m facing a problem with this code

NoviceC++Programmer

3 Jan, 2009 - 09:52 PM
Post #1

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The code is as follows:

******************************Code starts***********************
cpp

// trials.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <string.h>
#include <conio.h>

using namespace std;

class String
{
char *s;
int length;
public:
String(const char *);
String();
//operator const char* const() {return s};
};
int main(int argc, _TCHAR* argv[])
{
cout << "Test line" << endl;
String const s1 = "abc";
String const s2 = "def";

getch();
//return strcmp(s1,s2);
return 0;
}

*******************************Code Ends*************************

when running this using visual studio 2005. I m getting 2 errors which i cant resolve. The errors are:

Error 2 error LNK2001: unresolved external symbol "public: __thiscall String::String(char const *)" (??0String@@QAE@PBD@Z) trials.obj


Error 3 fatal error LNK1120: 1 unresolved externals C:\Documents and Settings\Administrator\My Documents\Visual Studio 2005\Projects\trials\Debug\trials.exe 1


Please Help. Thanks in advance.

** Edit ** code.gif

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no2pencil

RE: Public: __thiscall String::String(char Const *)

3 Jan, 2009 - 09:58 PM
Post #2

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QUOTE

CODE

     String(const char *);
     String();

Where is this function defined?

** Renamed title to be descriptive of problem **
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NoviceC++Programmer

RE: Public: __thiscall String::String(char Const *)

4 Jan, 2009 - 06:30 AM
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is it necessary? Are they not defined in include<string.h>??
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Bench

RE: Public: __thiscall String::String(char Const *)

4 Jan, 2009 - 07:01 AM
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C++ has its own standard string type (notice the lower-case s) which is defined in the <string> header within the std namespace. What makes you think that this will have any relationship to the String class that you've written?

<string.h> (or <cstring>, since string.h is deprecated) contains only C-style char array manipulation functions.

I assume you're writing your own String class as a learning exercise? (Otherwise its best to use the standard string type instead of reinventing the wheel). If so, where have you defined the two constructors which you've declared within your String class? The code you've given only declares their existence to the compiler - so if you haven't defined the constructors in full elsewhere, your compiler will have no idea what to do with them.

This post has been edited by Bench: 4 Jan, 2009 - 07:06 AM
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