42 lines
914 B
C++
42 lines
914 B
C++
#ifndef PFOR_PFOR_USEROP_H
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#define PFOR_PFOR_USEROP_H
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#include "expression/expression.h"
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namespace pfor {
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template<typename F>
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struct UserOperator {
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F f;
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template<typename... Args, std::enable_if_t<expr::allExpression<Args...>>* = nullptr>
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inline decltype(auto) eval(Args&&... args) {
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return f(std::forward<Args>(args).eval()...);
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}
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template<typename... Args>
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inline decltype(auto) eval(std::size_t i, Args&&... args) {
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return f(std::forward<Args>(args)[i]...);
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}
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};
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/**
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* @brief make an operator from a function
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*
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* @param[in] f a function
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*
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* @return an operator (UserOperator)
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*/
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template<typename F>
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auto makeOperator(F&& f) {
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return [f = std::forward<F>(f)](auto&&... args) {
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using Op = UserOperator<decltype(f)>;
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using Expr = pfor::expr::Expression<Op, expr::AsExpression<std::remove_reference_t<decltype(args)>>...>;
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return Expr{{f}, decltype(args)(args)...};
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};
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}
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}
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#endif
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