A lot of the complexity of the RCC++ solution over others (I listed those I can find on the wiki https://github.com/RuntimeCompiledCPlusPlus/RuntimeCompiledC...) is about compiling the minimum possible code quickly in a platform independent way. I'd love to see C++ get modules in the spec, along with introspection to make this easier.
Compiling C++ code at runtime is less about end-user code than about improving developer workflow for those who use C++ and want rapid iteration (game developers for example), so avoiding extra languages and VMs is one of the goals.
As for full dynamic dispatch, RCC++ does use virtual functions. I advocate using a 'data oriented approach' so the function table pointer lookup should be amortized by having expensive functions process multiple data items. In practice in my own code I see no detectable overhead.
Compiling C++ code at runtime is less about end-user code than about improving developer workflow for those who use C++ and want rapid iteration (game developers for example), so avoiding extra languages and VMs is one of the goals.
As for full dynamic dispatch, RCC++ does use virtual functions. I advocate using a 'data oriented approach' so the function table pointer lookup should be amortized by having expensive functions process multiple data items. In practice in my own code I see no detectable overhead.