std::memcpy(arr_copy, arr[0], sizeof arr); , on the other hand, causes undefined behavior (at least in C++; not entirely sure about C). ... <看更多>
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std::memcpy(arr_copy, arr[0], sizeof arr); , on the other hand, causes undefined behavior (at least in C++; not entirely sure about C). ... <看更多>
glibc/string/memcpy.c ... The GNU C Library is free software; you can redistribute it and/or ... memcpy (void *dstpp, const void *srcpp, size_t len). ... <看更多>
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不同的CPU架構, 指令集, OS, Compiler和memcpy function都會影響效率. 不確定你用的C library裡面的memcpy是怎麼寫的, 單就你結論提到差距10倍的 ... ... <看更多>
分享有趣C 語言小常識: 1. 為什麼memcpy() 多了一個function call overhead,有時候還是比自己用迴圈copy 資料快? 2. 什麼情況下不能用memcpy() 來在 ... ... <看更多>