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Creating a class instance (am i going insane?!)

This is a discussion on Creating a class instance (am i going insane?!) within the C++ Programming forums, part of the General Programming Boards category; Here is the code, tried fixing it for a hour now... I get Code: |12|error: 'Transmittance' was not declared in ...

  1. #1
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    Sep 2011
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    Creating a class instance (am i going insane?!)

    Here is the code, tried fixing it for a hour now...

    I get
    Code:
    |12|error: 'Transmittance' was not declared in this scope
    |12|error: expected ';' before 'PropylAcetate'
    Thank you for returning my sanity!

    main.cpp:
    Code:
    #include <iostream>
    #include <fstream>
    #include <cstdlib>
    
    #include "reinterpret.h"
    #include "Transmittance.h"
    
    using namespace std;
    
    int main()
    {
        Transmittance PropylAcetate(3696);
    
        return 0;
    }
    Transmittance.cpp
    Code:
    #include "Transmittance.h"
    
    Transmittance::Transmittance(int SIZE)
    {
        ifstream ifs ("jon_spec.SPA", ios::in|ios::binary);
    
        if (ifs.is_open())
        {
            TransmittancePercent* = new float [SIZE];
    
            ifs.seekg (0x568, ios::beg);
            ifs.read( addr(TransmittancePercent), sizeof(TransmittancePercent) );
            ifs.close();
        }
    
        else
        {
            cout << "Unable to open SPA file";
        }
    
    }
    Transmittance.h
    Code:
    #define TRANSMITTANCE_H
    #ifndef TRANSMITTANCE_H
    
    #include <iostream>
    using namespace std;
    
    
    class Transmittance
    {
        private:
        float* TransmittancePercent;
        float start, end, multiple;
        int size;
    
        public:
        Transmittance(int);
    
    };
    
    
    #endif
    My Ctrl+S addiction gets in the way when using Code Blocks...

  2. #2
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    Quote Originally Posted by JonathanS View Post
    Code:
    #define TRANSMITTANCE_H
    #ifndef TRANSMITTANCE_H
    
    /* ... */
    
    #endif
    Those first two statements are the wrong way around - the #ifndef will always be false, so the code that declares the class will never be seen by the compiler.
    stahta01 and laserlight like this.
    Programming and other random guff: cat /dev/thoughts > blogspot.com (previously prognix.blogspot.com)

    ~~~

    "The largest-scale pattern in the history of Unix is this: when and where Unix has adhered most closely to open-source practices, it has prospered. Attempts to proprietarize it have invariably resulted in stagnation and decline."

    Eric Raymond, The Art of Unix Programming

  3. #3
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    Silly me, thanks!
    My Ctrl+S addiction gets in the way when using Code Blocks...

  4. #4
    Cat without Hat CornedBee's Avatar
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    8,892
    On a side note, it's poor style to have "using namespace" in a header.
    laserlight likes this.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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