C99FunctionOverload

Pure standard C99 macro implementation to overload and set optional default parameters of C/C++ functions. Inspired by brilliant people at

http://stackoverflow.com/questions/3046889/optional-parameters-with-c-macros

Finally I come out with something that incorporates all the tricks, so that the solution

1. Uses only standard C99 macros to achieve function overloading, no GCC/CLANG/MSVC extension involved (i.e., comma swallowing by the specific expression , ##__VA_ARGS__ for GCC/CLANG, and implicit swallowing by ##__VA_ARGS__ for MSVC). So feel free to pass the missing --std=c99 to your compiler if you wish =)

2. Works for zero argument, as well as unlimited number of arguments, if you expand it further to suit your needs

3. Works reasonably cross-platform, at least tested for

   • GNU/Linux + GCC (GCC 4.9.2 on CentOS 7.0 x86_64)
   • GNU/Linux + CLANG/LLVM, (CLANG/LLVM 3.5.0 on CentOS 7.0 x86_64)
   • OS X + Xcode, (XCode 6.1.1 on OS X Yosemite 10.10.1)
   • Windows + Visual Studio, (Visual Studio 2013 Update 4 on Windows 7 SP1 64 bits)

Please refer to the link

http://stackoverflow.com/questions/3046889/optional-parameters-with-c-macros/28074198#28074198

for a more detailed walk-through of the codes.