PETSc version 3.17.4
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# PETSC_CONSTEXPR_14

C++14 constexpr

### Notes

Equivalent to constexpr when using a C++ compiler that supports C++14. Expands to nothing if the C++ compiler does not suppport C++14 or when not compiling with a C++ compiler. Note that this cannot be used in cases where an empty expansion would result in invalid code. It is safe to use this in C source files.

### Fortran Notes

Not available in Fortran

### Example Usage

      PETSC_CONSTEXPR_14 int factorial(int n)
      {
        int r = 1;

        do {
          r *= n;
        } while (--n);
        return r;
      }

### See Also

PETSC_NULLPTR, PETSC_NODISCARD

### Level

beginner

### Location

include/petscmacros.h
Index of all Sys routines
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