or.hpp

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#pragma once
 
#include "indep/macro/to.hpp"
 
namespace by {
 
#define __OR_DO__(_expr_)                             \
    | [&](auto&& __p) -> void {                       \
        __orStack__::push(nul(__p) ? _expr_ : false); \
    };                                                \
    if(__orStack__::pop())
 
#define OR_DO __OR_DO__(nul(__p))
 
#define __OR__(expr) __OR_DO__(expr) return BY_WHEN
#define OR __OR__(nul(__p))
#define OR_RET_CTOR __OR_DO__(nul(__p)) return
 
#define OR_CONTINUE OR_DO continue
 
    struct __orStack__ {
        static void push(nbool val) { _stack.push_back(val); }
 
        static nbool pop() {
            nbool ret = _stack.back();
            _stack.pop_back();
            return ret;
        }
 
    private:
        inline static std::vector<nbool> _stack;
    };
 
} // namespace by