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Thread: [C++] String type

  1. #1

    [C++] String type

    In PpmReader.cpp, I have:
    Code:
    #include "PpmReader.h"
    
    PpmReader::PpmReader() {
    	textureID = 0;
    }
    
    // line 26
    int PpmReader::load(string filename) { 
            // some stuff
    }
    In PpmReader.h, I have:
    Code:
    #ifndef PPMREADER_H
    #define PPMREADER_H
    
    #include <stdio.h>
    #include <malloc.h>
    #include <string>
    #include <GL/glut.h>
    
    class PpmReader {
    	private:
    		GLuint textureID; 
    	
    	public:
    		PpmReader();
    		int load(string filename);
    };
    
    #endif
    I get this error:
    Code:
    PpmReader.cpp(26) : error C2065: 'string' : undeclared identifier
    Why? Didn't I include the string library?

  2. #2
    C++'s string datatype is String
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  3. #3
    Actually, I forgot to do "using namespace std". C++ works with lowercase string. I believe that Java uses uppercase string.

  4. #4
    1) You shouldn't "use namespace std;" and pollute the global namespace. Instead you should fully qualify your use of string:
    Code:
    std::string foo;
    2) Why have you put so many include files in your header file? You should put as many includes as possible in your cpp files (as "best practice") for quite a few reasons.

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