deserialize-and-call.cpp

#include <stdio.h>

template <typename R, typename F> R callf(void* buffer, F func)
{
    return func();
}

template <typename R, typename F, typename ArgHead, typename ...ArgTail> R callf(void* buffer, F func)
{
    ArgHead* head = static_cast<ArgHead*>(buffer);
    auto next = [=](ArgTail... args) { return func(*head, args...); };
    return callf<R, decltype(next), ArgTail...>(head + 1, next);
}

template <typename R, typename T, typename ...Args> R call(void* buffer, T* obj, R (T::*method)(Args...))
{
    auto run = [=](Args... args) { return (obj->*method)(args...); };
    return callf<R, decltype(run), Args...>(buffer, run);
}
 
struct Foo
{
    int bar(int a, float b, char c)
    {
        printf("Foo::bar %d %f %c\n", a, b, c);
        return 42;
    }
};
 
int main()
{
    char buf[12] = {15, 1, 0, 0, 0, 0, 0x80, 0x3f, 'x'};
    Foo foo;
    int res = call(buf, &foo, &Foo::bar);
    printf("=> %d\n", res);
}