maybe_void.h

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#ifndef FREE_TENSOR_MAYBE_VOID_H
#define FREE_TENSOR_MAYBE_VOID_H
 
#include <type_traits>
#include <variant>
 
namespace freetensor {
 
template <class T> struct TypeOrMonostate { typedef T type; };
template <> struct TypeOrMonostate<void> { typedef std::monostate type; };
 
#define MAYBE_VOID_ASSIGN(name, expr)                                          \
    if constexpr (std::is_same_v<decltype(expr), void>) {                      \
        expr;                                                                  \
    } else {                                                                   \
        name = expr;                                                           \
    }
 
#define MAYBE_VOID(name, expr)                                                 \
    [[maybe_unused]] typename TypeOrMonostate<decltype(expr)>::type name;      \
    MAYBE_VOID_ASSIGN(name, expr)
 
} // namespace freetensor
 
#endif // FREE_TENSOR_MAYBE_VOID_H