For these the best approach is to write the whole app in some higher-than-C++ level language with performance critical parts (usually less than 10 percent) in C/C++.
That's often a good approach, but sometimes the overhead of marshaling data between the layers can kill you. For instance, Google warns people about assuming the apps written using the Android NDK will be faster, partly because of JNI overhead.
Comments
For these the best approach is to write the whole app in some higher-than-C++ level language with performance critical parts (usually less than 10 percent) in C/C++.
That's often a good approach, but sometimes the overhead of marshaling data between the layers can kill you. For instance, Google warns people about assuming the apps written using the Android NDK will be faster, partly because of JNI overhead.