const & a)\n {\n return a(std::forward(r)) ;\n }\n}\n\nnamespace views\n{\n inline static details::trim_view_range_adaptor trim;\n}\n\n// -------- tests\n\ntemplate \nvoid are_equal(std::vector const & input, std::vector const & output, P&& pred)\n{\n std::size_t index = 0;\n for(auto i : input | views::trim(std::forward

(pred)))\n {\n assert(i == output[index]);\n index++;\n }\n assert(index == output.size());\n}\n\ntemplate \nvoid are_equal_reverse1(std::vector const & input, std::vector const & output, P&& pred)\n{\n std::size_t index = 0;\n for(auto i : input | rg::views::reverse | views::trim(std::forward

(pred)))\n {\n assert(i == output[index]);\n index++;\n }\n assert(index == output.size());\n}\n\ntemplate \nvoid are_equal_reverse2(std::vector const & input, std::vector const & output, P&& pred)\n{\n std::size_t index = 0;\n for(auto i : input | views::trim(std::forward

(pred)) | rg::views::reverse)\n {\n assert(i == output[index]);\n index++;\n }\n assert(index == output.size());\n}\n\n// -------- main\n\nint main()\n{\n auto is_odd = [](const int x){return x%2==1;};\n \n are_equal({}, {}, is_odd);\n are_equal({1}, {}, is_odd); \n are_equal({1,3,5}, {}, is_odd);\n are_equal({2}, {2}, is_odd);\n are_equal({2,4}, {2,4}, is_odd);\n are_equal({2,3,4}, {2,3,4}, is_odd);\n are_equal({1,2,3,4}, {2,3,4}, is_odd);\n are_equal({1,1,2,3,4}, {2,3,4}, is_odd);\n are_equal({2,3,4,5}, {2,3,4}, is_odd);\n are_equal({2,3,4,5,5}, {2,3,4}, is_odd);\n are_equal({1,2,3,4,5}, {2,3,4}, is_odd);\n are_equal({1,1,2,3,4,5,5}, {2,3,4}, is_odd);\n \n are_equal_reverse1({}, {}, is_odd);\n are_equal_reverse1({1}, {}, is_odd); \n are_equal_reverse1({1,3,5}, {}, is_odd);\n are_equal_reverse1({2}, {2}, is_odd);\n are_equal_reverse1({2,4}, {4,2}, is_odd);\n are_equal_reverse1({2,3,4}, {4,3,2}, is_odd);\n are_equal_reverse1({1,2,3,4}, {4,3,2}, is_odd); \n are_equal_reverse1({1,1,2,3,4}, {4,3,2}, is_odd); \n are_equal_reverse1({2,3,4,5}, {4,3,2}, is_odd);\n are_equal_reverse1({2,3,4,5,5}, {4,3,2}, is_odd);\n are_equal_reverse1({1,2,3,4,5}, {4,3,2}, is_odd);\n are_equal_reverse1({1,1,2,3,4,5,5}, {4,3,2}, is_odd); \n \n are_equal_reverse2({}, {}, is_odd);\n are_equal_reverse2({1}, {}, is_odd);\n are_equal_reverse2({1,3,5}, {}, is_odd);\n are_equal_reverse2({2}, {2}, is_odd);\n are_equal_reverse2({2,4}, {4,2}, is_odd);\n are_equal_reverse2({2,3,4}, {4,3,2}, is_odd);\n are_equal_reverse2({1,2,3,4}, {4,3,2}, is_odd);\n are_equal_reverse2({1,1,2,3,4}, {4,3,2}, is_odd);\n \n are_equal_reverse2({2,3,4,5}, {4,3,2}, is_odd);\n are_equal_reverse2({2,3,4,5,5}, {4,3,2}, is_odd);\n are_equal_reverse2({1,2,3,4,5}, {4,3,2}, is_odd);\n are_equal_reverse2({1,1,2,3,4,5,5}, {4,3,2}, is_odd); 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