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#ifndef TYPEASVALUE_SRC_CONDITIONAL_COND_H_
#define TYPEASVALUE_SRC_CONDITIONAL_COND_H_
#include "type.h"
#include "list/cons.h"
#include "list/detail/find_variadic.h"
namespace tav {
namespace detail {
template <typename... Branches>
class select_cond_branch {
private:
template <typename Pair>
using predicate = IsTrue<Car<Pair>>;
public:
using type = Eval<detail::find_variadic<predicate, Branches...>>;
static_assert(
IsPair<type>::value,
"all branch conditions resolve to false"
);
};
}
template <typename... Branches>
using Cond = Cdr<Eval<detail::select_cond_branch<Branches...>>>;
template <
typename Condition,
typename Result
>
using Branch = Pair<Condition, Result>;
template <typename Result>
using Else = Branch<Boolean<true>, Result>;
}
#endif // TYPEASVALUE_SRC_CONDITIONAL_COND_H_
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