I propose that we introduce the following new preprocessor conditional
inclusion syntax:

    condexpr if (expression or identifier, expression or identifier...) {
        ....the conditional logic....
    }

New keyword to reserve: condexpr

Some advantages:
  - The syntax looks more like standard C++ code and less like preprocessor
directives
  - Rather than writing the preprocessor conditional inclusion syntax like
#ifdef and #endif at the beginning of each line, which breaks the flow of
code if the code is already nested, this syntax can be written directly
into the regular C++ code.

Here is how I would rewrite most of the example from the Conditional
Inclusion page here (
https://en.cppreference.com/w/cpp/preprocessor/conditional) using this new
syntax:

#define ABCD 2#include <iostream>
 int main(){
 condexpr if (ABCD)

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "1: yes\n";

}else

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "1: no\n";

} condexpr if (!ABCD)

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "2: no1\n";

}elif (ABCD == 2)

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "2: yes\n";

}else

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "2: no2\n";

} condexpr if (!(DCBA) && (ABCD < 2*4-3))

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "3: yes\n";

}
 condexpr if (CPU)

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "4: no1\n";

}elif (GPU)

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "4: no2\n";

}elif (!RAM)

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "4: yes\n";

}else

{
    std::cout <http://en.cppreference.com/w/cpp/io/cout> << "4: no!\n";
}



}