generalize static_for.h
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1 changed files with 33 additions and 44 deletions
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@ -7,62 +7,51 @@
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namespace MultiArrayTools
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{
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template <size_t BEG, size_t END>
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template <size_t BEG, size_t END, size_t OFF>
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struct sfor
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{
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template <typename F>
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static void execs(const F& f)
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template <typename Incr, typename F, typename Conc>
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static inline auto exec(Incr incr, F f, Conc conc)
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{
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if(BEG < END){
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f(std::integral_constant<size_t, BEG>{});
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sfor<BEG+1,END>::execs(f);
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}
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constexpr auto idx = std::integral_constant<size_t, BEG>{};
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constexpr auto idxm = std::integral_constant<size_t, BEG+OFF>{};
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static_assert(abs(idx.value - END) >= abs(incr(idx) - END),
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"this turns out to be a static endless loop");
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auto tmp = f(idxm);
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return conc(tmp, static_for<incr(idx),END,OFF>::exec(incr,f,conc));
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}
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template <typename F>
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static void execsr(const F& f)
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template <typename Incr, typename F, typename Create, typename... Args>
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static inline auto unpack(Incr incr, F f, Create create, const Args&... args)
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{
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if(BEG < END){
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f(std::integral_constant<size_t, END-1>{});
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sfor<BEG,END-1>::execsr(f);
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}
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}
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template <typename F>
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static void exec(const F& f)
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{
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f(std::integral_constant<size_t, BEG>{});
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sfor<BEG+1,END>::exec(f);
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}
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template <typename F>
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static void execr(const F& f)
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{
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f(std::integral_constant<size_t, END-1>{});
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sfor<BEG,END-1>::execr(f);
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constexpr auto idx = std::integral_constant<size_t, BEG>{};
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constexpr auto idxm = std::integral_constant<size_t, BEG+OFF>{};
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static_assert(abs(idx.value - END) >= abs(incr(idx) - END),
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"this turns out to be a static endless loop");
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auto tmp = f(idxm);
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return static_for<incr(idx),END,OFF>::unpack(incr, f, create, args..., tmp);
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}
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};
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template <size_t N>
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struct sfor<N,N>
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template <size_t END, size_t OFF>
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struct sfor<END,END,OFF>
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{
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template <typename F>
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static void execs(const F& f) {}
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template <typename Incr, typename F, typename Conc>
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static inline auto exec(Incr incr, F f, Conc conc)
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{
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return 0;
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}
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template <typename F>
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static void execsr(const F& f) {}
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template <typename F>
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static void exec(const F& f) {}
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template <typename F>
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static void execr(const F& f) {}
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template <typename Incr, typename F, typename Create, typename... Args>
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static inline auto unpack(Incr incr, F f, Create create, const Args&... args)
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{
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return create(args...);
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}
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};
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}
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#define MA_SSFOR(i,beg,end,expr) MultiArrayTools::sfor<beg,end>::execs([&](auto i){ expr })
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#define MA_SSRFOR(i,end,beg,expr) MultiArrayTools::sfor<beg,end>::execsr([&](auto i){ expr })
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#define MA_SFOR(i,beg,end,expr) MultiArrayTools::sfor<beg,end>::exec([&](auto i){ expr })
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#define MA_SRFOR(i,end,beg,expr) MultiArrayTools::sfor<beg,end>::execr([&](auto i){ expr })
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#define MA_SFOR(i,beg,end,incr,expr) static_for<beg,end,0>::exec([&](auto i) constexpr { return incr; }, [&](auto i){ expr return 0; }, [&](auto f, auto next) { return 0; })
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#define MA_SRFOR(i,beg,end,decr,expr) static_for<beg,end,-1>::exec([&](auto i) constexpr { return decr; }, [&](auto i){ expr return 0; }, [&](auto f, auto next) { return 0; })
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#define MA_CFOR(i,beg,end,incr,expr,cre) static_for<beg,end,0>::unpack([&](auto i) constexpr { return incr; }, [&](auto i){ expr }, [&](auto... args) { return cre(args...); })
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#endif
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