Alternatively, the first character of the format string can be used to indicate the byte order, size and alignment of the packed data, according to the following table: If the first character is not one of these
connect( clientfd, (structsockaddr *)&server_addr,sizeof(server_addr)) ) 上面红色的 htons 函数的作用是将 端口号 由主机字节序转成网络字节序,网络字节序大多时候都是固定为大端字节序的,但不同的机器,主机字节序却不一样,如果本身就已经是大端了,调用 htons 函数,返回值和实参是一样的,如果本身是小端...
是一种在数据库中进行排序和计数的操作。它可以根据指定的条件对数据库中的数据进行排序,并返回符合条件的数据的数量。 在关系型数据库中,orderBy计数的原理查询通常涉及以下几个步骤: 1. 排序:...
This tutorial covers big and little endian byte order, conversion and bit fields. The YoLinux portal covers topics from desktop to servers and from developers to users
(T)); } // 走到这里,说明类型T横跨了两个buffer,逐一读取一个byte,拼成一个T static_assert(sizeof(T) <= sizeof(uint64_t)); uint64_t value = 0; for (int32_t i = 0; i < sizeof(T); ++i) { // readByte读取一个Buffer value |= static_cast<uint64_t>(readByte()) << (i...
Looking at A in memory, we find that the address of A[1,1] + 24 is, in fact, the address of A[2,3]. Sign in to download full-size image In the vector case, we were able to simplify the calculation when upper and lower bounds were known at compile time. Applying the same ...
The data order conversion unit may comprise a load aligner and/or a store aligner, one or both of which may comprise means for shifting informational unit of a smaller size within informational units of a larger size. The shift amount may derive from the low order address bits and may be ...
真正的排序算法(函数)是由my_string_ptr_sort实现的,它又有两种策略:当size <= 20 && items >= 1000 && items <100000(每条记录的大小小于20Byte,并且记录数据[1000,100000])的使用radixsort_for_str_ptr【Radixsort for pointers to fixed length strings. A very quick sort for not to long (< 20...
1.1 最左匹配原则 CREATE TABLE members( id int not null, age int not null, viplevel int not...
10 * sizeof(int), b, 0, NULL, &writeEventB); // Set kernel arguments … size_t localws[1] = {2}; size_t globalws[1] = {10}; // Wait on both writes before executing the kernel cl_event eventList[2]; eventList[0] = writeEventA; eventList[1] = writeEventB; clEnqueueNDRa...