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There are numerous types of programming languages developed in the lastdecades, and most of them provide interface to call C++ or C for highefficiency implementation. The motivation of Svar is to design an efficient,light-weighted and general middle-ware for multiple languages, meanwhile,brings the dynamism features from script language to C++ in a straightforwardway. Firstly, a Svar class with JSON like data structure is designed to holdeverything exists in C++, including basic values, functions or user definedclasses and objects. Secondly, arguments are auto cast to and from Svarefficiently with compile time pointers, references and shared\_ptr detection.Thirdly, classes and functions are binded with string names to supportreflection, this means all functions and classes in a shared library can beexported to a Svar object, which also calls a Svar module. The Svar modules canbe accessed by different languages and this paper demonstrates how to importand use a Svar module in Python and Node.js. Moreover, the Svar modules or evena python module can also be imported by C++ at runtime, which makes C++ easierto compile and use since headers are not required anymore. We compare theperformance of Svar with two state-of-the-art binding tool for Python andNode.js, and the result demonstrates that Svar is efficient, elegant andgeneral. The core of this project is one single tiny modern C++ header withless than 5000 lines code without extra dependency. To help developers usingSvar, all the source codes related are public available onhttp://github.com/zdzhaoyong/Svar, including documentations and benchmarks.

Svar: A Tiny C++ Header Brings Unified Interface for Multiple programming Languages