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What scripting languages can only interface to libraries that implement a C API? Assume we won't be using SWIG or other third-party tool. One example of such a scripting language is Lua.
Pretty much all the major languages have a runtime based in C and require you to directly or indirectly through FFI interface through a C API/ABI, these include but are not limited to the following.
Squirrel
Lua
Ruby
Python
JavaScript
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I feel that header files which i include in c++ acts as equivalents of GEMS in ruby but i am not sure.A brief description of gems along the lines of c++ will be helpful
In languages such as Ruby and Java you merely 'require' or similar a package (which is called a gem in Ruby). In C++, you generally need both to #include one or more header files, and also to link with a (dynamic or static) library.
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I just want to know who is the owner of C and C++ like Oracle is the owner of Java and they release new versions of Java. So who can provide updates for C and C++.
C++ and C are designed by (different) ISO committee. The languages are public, with only the official specification being copyright protected and the property of ISO. Anybody can implement the language, however.
In fact two of the popular implementations, Clang and GCC, are open source and free software respectively.
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I'm in the process of learning C++ and was wondering about the graphical implications of C++.
I know Chrome was developed in C++, but I don't see how to replicate it or create any sort of GUI.
How is Chrome programmed for the UI?
C++ doesn't include any graphical library in it. So you need to use any existing third-party library or API of operating system.
For example, there exists next graphical libraries, which supports C++:
MFC
Qt
wxWidgets
TCL/Tk
GTK+
Some of them are object oriented and some - not. Some of them are portable, some - not. Some of them are proprietary, some - not.
Also you always can use low-level API's such as Win32 API
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I constructed my code in objective-c for ios in-app purchasing.
There is one project needs c++ code.
Just wonder if I change iap objective-c code to c++,
is there any special point I need to notice?
Your comment welcome
You cannot use Objective-C objects in C++. But C++ can use Objective-C library with C interface. Objective-C++ can use Objective-C objects in C++ too.
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Can C or C++ be used to program a library in python? I know that python can be used to write a library but I am wondering if C or C++ can be used.
Definitely. There are lots of high performance libraries written in C (simplejson being a notable and fairly simple example.)
See http://wiki.python.org/moin/IntegratingPythonWithOtherLanguages