or_else:若是有值,返回optional;若是无值,则调用传入的函数,在此可以处理错误。 在R2中map()被重命名为transform(),因此实际新增的三个函数为transform(),and_then()和or_else()。 这些函数主要是避免手动检查optional值是否有效,比如: 一个使用的小例子: 错误的情况: 目前GCC 12,Clang 14,MSVC v19.32已经...
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copy, copy_n, , fill, fill_n, move, reverse, , reverse_copy, rotate, rotate_copyshift_left, shift_right,swap_ranges Yukarıdaki kategoride yer alan bu algoritmalar için kullanıcı paralelliği gereksinimleri üzerinde karışıklık vardır: generate, generate_n ...
copy, copy_n, fill, fill_n, move, reverse, reverse_copy, rotate, rotate_copy, shift_left, shift_right, swap_ranges Confusion over user parallelism requirements exists for these algorithms, which are likely in the above category anyway: generate, generate_n Effective parallelism of these alg...
copy, copy_n, fill, fill_n, move, reverse, reverse_copy, rotate, rotate_copy, shift_left, shift_right, swap_ranges Confusion over user parallelism requirements exists for these algorithms, which are likely in the above category anyway: generate, generate_n Effective parallelism of these alg...
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transform una::views::filter una::views::drop una::views::take//In C++20, you can just use std::ranges variants of these ranges,//but always use una::views::reverse from this library//because std::views::reverse is not good enought for Unicode.//You use these ranges the same way ...
where S~ is the Fourier transform of S in its first variable. If relative momentum Q is much smaller compared to the average momentum of the pair K=(p1+p2)/2, then Eq. (5) can be expressed as: C2(Q,K)=1+|S~(Q,K)|2|S~(Q=0,K)|2. (6) ...
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