Compiler Error C3047

Structured block in an OpenMP 'sections' region must be preceded by '#pragma omp section'

Any code in a code block introduced by a sections directive must be in a code block introduced by a section directive.

This error is obsolete in Visual Studio 2022 and later versions.

The following sample generates C3047:

// C3047.cpp
// compile with: /openmp /c
#include "omp.h"

int main() {
   int n2 = 2, n3 = 3;

   #pragma omp parallel
   {
      ++n2;

      #pragma omp sections
      {

         #pragma omp section
         {
            ++n3;
         }

         ++n2;   // C3047 not enclosed in #pragma omp section
      }
   }
}