AMReX_EB2_IF_Complement.H

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#ifndef AMREX_EB2_IF_COMPLEMENT_H_
#define AMREX_EB2_IF_COMPLEMENT_H_
#include <AMReX_Config.H>
 
#include <AMReX_Array.H>
#include <AMReX_EB2_IF_Base.H>
 
#include <type_traits>
 
// For all implicit functions, >0: body; =0: boundary; <0: fluid
 
namespace amrex::EB2 {
 
template <class F>
class ComplementIF
{
public:
 
    ComplementIF (F a_f) : m_f(std::move(a_f)) {}
 
    [[nodiscard]] AMREX_FORCE_INLINE Real operator() (const RealArray& p) const noexcept
    {
        return -m_f(p);
    }
 
 
    [[nodiscard]] AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
    Real operator() (AMREX_D_DECL(Real x, Real y, Real z)) const noexcept
        requires (IsGPUable<F>::value)
    {
        return -m_f(AMREX_D_DECL(x,y,z));
    }
 
protected:
 
    F m_f;
};
 
template <class F>
requires (IsGPUable<F>::value)
struct IsGPUable<ComplementIF<F>> : std::true_type {};
 
template <class F>
constexpr ComplementIF<std::decay_t<F>>
makeComplement (F&& f)
{
    return ComplementIF<std::decay_t<F>>(std::forward<F>(f));
}
 
}
 
#endif