size

In C++, I'm wondering why the bool type is 8 bits long (on my system), where only one bit is enough to hold the boolean value ? I used to believe it was for performance reasons, but then on a 32 bits or 64 bits machine, where registers are 32 or 64 bits wide, what's the performance advantage ? Or is it just one of these 'historical' reasons ? Because every C++ data type must be addressable. How would you create a pointer to a single bit? You can't. But you can create a pointer to a byte. So a boolean in C++ is typically byte-sized. (It may be larger as well. That's up to the implementation.

This question already has an answer here: LISTAGG function: “result of string concatenation is too long” 12 answers Created one view within which one field(of 6) is a concatenation of two fields from the source table. Created a second view that uses listagg to potentially combine the results of the concatenation. Using this two step operation correctly returns the listagg concatenation of the two fields from the source table. When I try to create one view that will both produce the concatenation and the listagg, I get the oracle error ora-01489 Result of string concatenation is too long. As a

How can I determine size of an array (length / number of items) in C#? If it's a one-dimensional array a , a.Length will give the number of elements of a . If b is a rectangular multi-dimensional array (for example, int[,] b = new int[3, 5]; ) b.Rank will give the number of dimensions (2) and b.GetLength(dimensionIndex) will get the length of any given dimension (0-based indexing for the dimensions - so b.GetLength(0) is 3 and b.GetLength(1) is 5). See System.Array documentation for more info. As @Lucero points out in the comments, there is a concept of a "jagged array", which is really

https://www.cnblogs.com/pokerface/p/5217106.html cmd_bootm.c //传递给内核的参数 int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) do_bootm_linux (cmdtp, flag, argc, argv, addr, len_ptr, verify); 原型：void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[], ulong addr, ulong *len_ptr, int verify) char *commandline = getenv ("bootargs"); void (*theKernel)(int zero, int arch, uint params); //函数指针 theKernel = (void (*)(int, int, uint))ntohl(hdr->ih_ep); //跳转到内核的位置ntohl(hdr->ih_ep) setup_start_tag //tag分为tag_header、union.u两部分组成 params->hdr.tag = 0x54410001 //tag