Errors from STL

This is a discussion on Errors from STL within the C++ Programming forums, part of the General Programming Boards category; Like the title says, when I try to compile my program, I get errors from inside the list.h code, for ...

  1. #1
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    Nov 2001
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    19

    Errors from STL

    Like the title says, when I try to compile my program, I get errors from inside the list.h code, for the list STL. Here is the code in question:

    #include<stdlib.h>
    #include<stdio.h>
    #include<iostream.h>
    #include<list.h>
    #include "Event.h"
    #include "main.h"

    int main(void)
    {
    float simulated_time = 0;

    Event event_1(40, .23);
    Event event_2(45, .45);

    if(event_1.get_arrival_time() > simulated_time)
    simulated_time = event_1.get_arrival_time();

    list<Event> ReadyList;
    ReadyList.push_front(event_1);

    }

    void cause(char event, Event thisEvent, float TimeEvent)
    {
    if(event == 'a')
    ReadyList.push_front(thisEvent);
    }

    I'm using msvc++. These are the errors I recieve:
    Compiling...
    main.cpp
    c:\program files\microsoft visual studio\vc98\include\list.h(37) : error C2146: syntax error : missing ';' before identifier 'Length'
    c:\program files\microsoft visual studio\vc98\include\list.h(37) : error C2501: 'DWORD' : missing storage-class or type specifiers
    c:\program files\microsoft visual studio\vc98\include\list.h(37) : error C2501: 'Length' : missing storage-class or type specifiers
    c:\program files\microsoft visual studio\vc98\include\list.h(53) : error C2146: syntax error : missing ';' before identifier 'GetPrevLink'
    c:\program files\microsoft visual studio\vc98\include\list.h(53) : error C2433: 'WINAPI' : 'inline' not permitted on data declarations
    c:\program files\microsoft visual studio\vc98\include\list.h(53) : fatal error C1004: unexpected end of file found
    Error executing cl.exe.

    TIA

  2. #2
    Registered User
    Join Date
    Feb 2002
    Posts
    114
    I see that you don't use the std namespace, which I think is good practice. But you must not forget to use the std:: then!

    Code:
    std::list<Event> ReadyList;
    I'm really not sure if this will solve your problem, but thats the only fault I see. Except some bad programming practice.

    Code:
    // this is bad looking code:
    if(event_1.get_arrival_time() > simulated_time) 
    simulated_time = event_1.get_arrival_time();
    
    //either do this:
    if(event_1.get_arrival_time() > simulated_time) simulated_time = event_1.get_arrival_time();
    
    //or this:  <- I prefer to do this.
    if(event_1.get_arrival_time() > simulated_time){
        simulated_time = event_1.get_arrival_time();
    }
    It's the same code only looks different. Why do this? Easier to read, you won't missinterpritate the statement. This is otherwise a common bug place, just because you read the statement the wrong way. Look at this:

    [code]
    Code:
    // this time I add another thing to the if statement:
    if(event_1.get_arrival_time() > simulated_time) 
    simulated_time = event_1.get_arrival_time();
    simulated_time += TIME_CONSTANT;
    
    //OPS! error because I wanted the time_constant to be added to the simulated time if the ifstatement was true. And this bug only because I forgot the braces in the first place. If they were there from the beginning I wouldn't have missed them.
    Well you get the idea: get it right the first time.

    Tip:
    Also i'm not sure abou the stl-list, but generally there are different insert time for push_front and push_back function. If i'm not totally lost right now, the push_back is faster than the front version. Do i performance check on the two and see. It might as well be the pop_front - pop_back that differs in time.

    Well enough ranting

  3. #3
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    Ok, if I wanted a lesson in how to write C, I would have asked for it. Now, does anyone know why I'm getting these errors?

  4. #4
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    Guest
    I believe you have to use:

    #include <list>

    without the .h if you are using list class from STL. If that is the case, then I you may also need to drop the .h extension from the other indluded files and use a namespace like this:

    using namespace std;

    in the global name space or use namespace specifiers as in the previous post.

    I do not usually use main.h in my list of includes, but I'm not sure if listing it will create an error.

  5. #5
    Registered User
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    Aug 2001
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    57
    some of those errors could be in the class header you should post it too
    =@-OmegatronO-@=

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