查询词典 nil pointer

This invention discloses a multi-queue sequence buffer management circuit and a method based on a pipeline applying a pipeline structure including: an arbitration circuit selecting one for process from read, write and distribution buffer requests, a buffer slot state module designing state of the slot requiring operation and queue numbers and assigning idle slots, a buffer slot filter module filtering the slot, a buffer slot filter module filtering the slot states not belonging to the current operation queues nor idle aligned in terms of the head pointer, a queue slot selection module computing continuous idle slot numbers from the slot pointed by the head pointer and refreshing the head pointer and selecting preparing slots, a queue slot prior queuing module refreshing the read pointer and result numbers of the current operation queues with the pointer of the first prepare slots and their numbers which can support multi-queue to share one buffer space, queues can access the buffer in overlap.

本发明公开一种基于流水线的多队列顺序化缓冲管理电路及方法，本发明电路采用流水线结构，包括：仲裁电路，从读、写、分配缓冲请求中选取一路进行处理；缓冲槽口状态设置模块，设置请求操作的槽口状态和队列号，分配空闲槽口；缓冲槽口滤除模块，滤除不属于当前操作队列且非空闲态的槽口状态，按头指针对齐；队列槽口选择模块，计算头指针指向槽口起的连续空闲槽口数并更新头指针，选出预备态的槽口；队列槽口优先排队模块，用第一个预备态槽口的指针和预备态槽口数分别更新当前操作队列的读指针和结果数；本发明可以支持多个队列共享一个缓冲空间，各类指令队列能对缓冲进行交叉访问，并对指令结果的写入读出进行顺序化管理。

Because a constructor sets the fields of a new object to zero or empty values before performing other actions, class-type and pointer-type fields in a partially constructed object are always nil. A destructor should therefore check for nil values before operating on class-type or pointer-type fields.

因为构造函数在执行其它动作之前先设置新对象的字段为 0 或空值，在一个只构建了一部分的对象中，类类型和指针类型的字段总是 nil，所以，在操作类类型和指针类型的字段时，析构函数必须检查它们是否为 nil。

In this paper,we first introduce the research background and theory foundation of the project.Then we present a new technique for designing theorem prover which mainly based on transformation and substitution for Pointer Logic,and we have implemented this technique in a tool called APL.As an extension of Hoare logic, Pointer Logic can be used for accurate pointer analysis of pointer programs.

在本文中，我们首先介绍了项目的研究背景和理论基础，然后提出了一种为指针逻辑来设计自动定理证明器的新技术，这项技术主要是基于变换和替代，我们已经在一个被称为APL的工具中实现了该技术。

Furthermore, debugging tools and program analyzing tools will be more powerful if an efficient pointer analysis module is embedded Right for the importance of pointer analysis, many studies have been done in order to find an efficient and effective solution to pointer analysis. Many pointer analysis algorithms have been developed too.

正因为指针分析具有诸多非常重要的意义，曾有许多学者对这个问题进行了研究，也提出了多种指针分析的算法，然而以往的指针分析方法存在着如下不足：对赋值语句的指针分析还不够完善，这尤其表现在对结构赋值语句以及对递归数据结构内递归数据域的分析上。

In terms of this framework, we have designed a pointer logic system for a subset of C language. The style of this logic is something like the style of Hoare logic. It can be used for accurate pointer analysis of pointer programs. The information from the analysis can be used to prove the side conditions of typing rules and then to support static type checking of programs.

根据这个框架，我们为C语言的一个子集设计了一种指针逻辑系统，该逻辑系统的形式和Hoare逻辑的形式类似，它可用来对指针程序进行精确的指针分析，所获得信息用来证明指针程序是否满足定型规则的附加条件，以支持程序的静态类型检查。

Example of this can be found within text-processing applications, which uses an I-beam pointer that is shaped like a capital I , or in web browsers which often indicate that the pointer is over a hyperlink by turning the pointer in the shape of a gloved hand with outstretched index finger.

例如，可以找到文字处理应用软件，它使用一个工字钢指针的形状像资本我，或在网页浏览器，这往往表明，该指针是一个超链接，把指针的形状戴着手套的手伸出食指。

It's also important that you understand how the virtual function table works, so you understand the extra steps that can decrease performance that take place when you call a virtual function (each object has a virtual function table pointer hidden from you in its structure data , and to call a virtual function, you need to follow that pointer to the table, and then jump to the function pointer contained within, which can hurt caching).

理解虚函数表是如何工作的也同样重要，这样你就能够理解当你调用虚函数时需要的额外步骤，这些步骤会降低性能(每个对象都有一个隐藏的虚函数表指针，这样调用一个虚函数，你需要根据这个指针找到那个函数表，然后跳到它所包含的函数指针所指的函数里，这会降低cache的效果)。

In pointer context, the integer constant zero means "null pointer"- irrespective of the actual binary representation of a null pointer.

本节将指导您一些 C++中积灰尘的角落，这些往往被滥用，或是人们常常出错的地方。

Three Alexander Dennis Super Pointer Dart decorated with special livery were entered service in Jun 07 for the opening of the Airport route NR334. These Super Pointer Darts featured with luggage-rack installed but not provide any space for wheelchairs. The capacity is 33 seats and 33 standees while the Dennis Super Pointer Dart is 39 seats and 25 standees. The oil-tank inlet was relocated at the rear of the left.

为配合往返机场路线NR334开办，珀丽湾客运於二零零七年引进多三架以亚历山大丹尼士为品牌的Super Pointer Dart，车身披有独特的涂装，而且装上大型行李架，但没有提供摆放轮椅位置，载客量亦由先前八架Super Pointer Dart的39人座位加25人企位，变成33人座位及33人企位，另外，入油位置亦改为於左边车尾。

In the end I came on with 15 minutes left, nil-nil on the scoreboard.

在比赛还剩下15分钟的时候我获得了出场机会。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。