Asterisk and pointer conversion

[BillWang]

Hello, all
I am pretty new to C++ but have some experience with Java and other programming language. Currently I am having some problem with the the asterisk and pointers. The project is to develop a math equation rendering engine, using MathJax and env.js. I got a envjsnatives.cpp file from QT platform. In the file, there is a function called initializeEnvjsNatives.

  // Exported API.
void initializeEnvjsNatives(QScriptEngine *);

I included the cpp file and called the function with a engine object (if I am correct.) see partial code.

#include "envjsnatives.cpp"
    QString scriptFileName(":/env.js");
    QFile scriptFile(scriptFileName);
    scriptFile.open(QIODevice::ReadOnly);
    engine.evaluate(scriptFile.readAll(), scriptFileName);
    scriptFile.close();
    initializeEnvjsNatives(engine);

When I build the project, I got this

main.cpp:20: error: cannot convert 'QScriptEngine' to 'QScriptEngine*' for 
argument '1' to 'void initializeEnvjsNatives(QScriptEngine*)'

What's the problem? I think it is the pointer conversion.

[vlad from moscow]

The error message is clear enough. Instead of the object itself you should use a pointer to the object as the function argument.
I only wonder do you have indeed some experience with Java and other programming languages?!

[BillWang]

At least I finished Java computer science AP course and passed Google Code Jam qualification round using java. And I know this is a pretty stupid question, so I posted in the beginner section.

[ne555]

> I included the cpp file
You shouldn't include *.cpp (function definitions), it will give you a multiple definition error.
Use the linker instead

[BillWang]

I realized that problem after I fixed the pointer. Unfortunately, that file doesn't come with a .h

[LB]

It's not supposed to come with a .h, and you're still not supposed to #include the .cpp

[BillWang]

I created a .h with what I need.