C++ :: Defining Function Prototypes In Header File Without Implemented Body
Oct 6, 2014
Basically, I have made a program which implements the platform specific layers (such as entry function, file loading, timing functions etc.) that gets compiled into a .exe (or platform equivalent).
But I want to make this portable and reusable across other projects, so the entry function for the platform will call the function "AppMain" which is the generic main function that is not reliant on the underlying platform etc. (i.e defined in a .h file that the project module will implement).
Ideally I would want to build the AppMain code into its own library. However, This AppMain code would want access to the Platform functions such as the functions compiled into the .exe.
This has confused me somewhat and has forced me to build both the AppMain module and the Platform Code into the same exe file so they can use each others functions.
Is there any way I can create a header file (with all the function prototypes in) but they do not get implemented in the Platform code but rather they can be 'guaranteed' to be available at runtime?
Here is what I am trying to achieve in a high level view:
win32layer.cpp: (implements all the functions defined in Platform.h)
in this scenario of course I could not compile the platform functions as the application has not been created and thus appmain cannot call the platform functions because that has not been created etc....
I am work on building a simple parse tree and the layout of my code look like this:
Headers pt_node.hiterator.hparsetree.h
Source files node.cppparsetree.cppmain.cpp
I am still relatively new to C++ , and have been advised to include function definition for the member function of both pt_node class and iterator class in the node.cpp file
I particular I have declare the following iterator.h:
In the private part of a class and it is giving me the error "Member function prototypes not supported". How do I fix this and what is a member function prototype exactly?
I'm trying to define a 7x5 array in main and then use it in a different function that will fill that array with random floats between 0.0 and 1.0 and then use main to print the final, filled array.
This is a program I developed in which we had to define a class named BOOK with the data members and member functions as shown in the program..We have to:
(i) Make the user enter the values in the array BOOK. (ii) Display the details that the user entered. (iii) Search for a book from the array upon its Bno and display its details. (iv) Search for a book from the array upon its Bname and display its details.
PROGRAM:
#include<iostream.h> #include<conio.h> #include<stdio.h> #include<string.h> class BOOK { private: int Bno; char Bname[20];
[Code] .....
But while running it the compiler gives the errors as:
Line 43 to 48: Illegal character '' (0x5c) Line 69: Undefined symbol 'Display' Line 88: 'BOOK::Bno' is not accessible. Line 89:'BOOK::Bname' is not accessible. Line 90:'BOOK::Author' is not accesible. Line 91:'BOOK::Price' is not accesible. Line 108:'BOOK::Bno' is not accessible. Line 109:'BOOK::Bname' is not accessible. Line 110:'BOOK::Author' is not accesible. Line 111:'BOOK::Price' is not accesible. from 43 to 48..the line feed was also used at many other places but there it was not given as an error so why here? Line 69: I defined the Display() function outside the class since it contained control structures, so what's the error then?
About the lines the rest of the error( the "not accessible" ones) I know these data members are not accessible because they are in private visibility mode. But then how to make them accessible? (Without putting them in public because it was a part of the question to create the data members in private).
public class MyClass { public int age { get; set; } } static void Main(string[] args) { MyClass testing = new MyClass(); testing.age = 44; Console.WriteLine(testing.age); }
output: 44
Code using regular variable declaration:
public class MyClass { public int age; } static void Main(string[] args) { MyClass testing = new MyClass(); testing.age = 44; Console.WriteLine(testing.age); }
output: 44
Why use the auto-implemented property when you can just as equally use the second code block to achieve the same thing?
I get the following error in XCode whenever I try to access the member I created 'randomGen' in a separate class in a different header file. I have made sure to include the header file and have tried to access it through an object.
This is the code I enter when trying to access the method from randomiser.h in main.cpp. It is also an overloaded function with doubles and integers:
RandomG randomiser; randomiser.randomGen(); // 'Call to member function 'randomGen' is ambiguous'
This is the code inside randomiser.h:
#include <string> #include <iostream> using std::string; using std::cout; using std::endl; class RandomG {
[Code] ....
This is the error inside xcode: [URL] ....
I have tried seperating the code for the functions in another class (main.cpp) and then running and it seems to works, so I'm not sure why I can't put everything in the .h file and then access it?
I would like it in a seperate file so it doesn't clutter my main. I am writing a game with SDL so that might be confusing and I would like the window to have a random title and other random properties, so it would be easier to use a function.
I tried to write a code to calculate black body spectra over an user-entered range of wavelength and temperatures. The equation I'm trying to code is the second one this image (stolen from Wikipedia)The syntax to run it is bbgrid lambda_inic lambda_final temp_inic temp_final inc_T inc_lambda
where bbgrid is the name of the program, lambda_inic and lambda_final are the limits of the wavelenght range (in units of angstroms, 1A=10⁻⁰m), temp_inic and temp_final are the limits of the temperature range (in Kelvins) and inc_T and inc_lambda are the increments. What I want to do is, given the ranges of temperatures and wavelengths, to run the code over the lambdas and the temperatures.
The problem is that the behaviour of the intensities (what I'm calculating) is erratic. Sometimes it is highly positive, sometimes immensely negative and turning between those two. As an example of an output file, I'm getting things like this:
While I was trying to debug the code, I found the problem may reside in the exponential factor in the denominator. I wrote some lines to calculate and print on the screen only the exponential, and it was oscillating like crazy. The output file should produce curves like this:
I have an assignment where i am required to code up in C, a program to simulate a taxi rank that is implemented as a queue via an array that can hold up to a maximum of six taxis.When a taxi arrives, it joins the rear of the queue. When a taxi departs, the first taxi in the rank is used and its departure is logged.A "rolling menu" comprising integer codes as specified below is used until 0 is entered to exit the simulation. I've done this stage but now the next stage is asking me to implement the queue as a linked list. what the difference is between an array and a linked list and what is a linked list?
I have written my program and it works when I keep everything in the header files, and then have my main. I am now splitting them up into implementation files, but Eclipse keeps giving me errors. It gives me error at every opening brace of the constructor and functions. It says on all of them "Redefinition of (name of constructor or method), Previously declared here." What am I doing wrong, because it works in the header file?
