Apache Cassandra static column 介绍与实战 Spark大数据博客 - https://www.iteblog.com Apache Cassandra static column 介绍与实战 假设我们有这样的场景：我们想在 Cassandra 中使用一张表记录用户基本信息（比如 email、密 码等）以及用户状态更新。我们知道，用户的基本信息一般很少会变动，但是状态会经常变化， ，Cassandra 引入了 static column。同一个 partition key 中被声明为 static 的列只有一个值的，也就是只存储一份。 如果想及时了 解Spark、Hadoop或者Hbase相关的文章，欢迎关注微信公共帐号：iteblog_hadoop 定义 static column 在表中将某个列定义为 STATIC 很简单，只需要在列的最后面加上 STATIC 关键字，具体如下： "email" text STATIC, "encrypted_password" blob STATIC, "body" text, PRIMARY KEY ("username", "id") ); iteblog_users_with_status_updates 表中我们将 email 和 encrypted_password 两个字段设置为 STATIC 了，这意味着同一个 username

第三届中国Rust开发者大会 Rustle: the first static analyzer for smart contracts in Rust Matthew Jiang Director of Security Team @ BlockSec Motivation Background Design 1 2 3 Capability Usability Conclusion with_attached_deposit(1) .with_static_gas(GAS_FOR_FT_TRANSFER_CALL) .ft_transfer_call(self.depositor.clone(), amount, None, "".to_string()) .then( ext_self::ext(env::current_account_id()) .with_static_gas(GAS_FOR_FT_RESOLVE_TRANSFER) documentation and samples is preferred Welcome to Contribute Usability Conclusion • Rustle is the first static analyzer for smart contracts in Rust and has been integrated into our workflow • Rustle supports

Finding Bugs using Path-Sensitive Static Analysis Gábor Horváth Gabor.Horvath@microsoft.com @XazaxHunWelcome to CppCon 2021! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord the latest announcements Take our survey https://aka.ms/cppconAgenda • Intro to path-sensitive static analysis • Path-sensitive checks in MSVC • A look under the hood • Upcoming features • Lessons Documentation in The Era of Concepts and Ranges – Sy Brand & Christopher Di Bella (Google) • Static Analysis and Program Safety in C+ +: Making it Real – Sunny Chatterjee • In-memory and Persistent

meta_fun = this_talk; 2 / 58❓static_assert(Template::Metaprogramming::is_hard); // ✔ 3 / 58❓static_assert(Template::Metaprogramming::is_hard); // ✔ ❓static_assert(Template::Metaprogramming::is_powerful); is_powerful); // ✔ 3 / 58❓static_assert(Template::Metaprogramming::is_hard); // ✔ ❓static_assert(Template::Metaprogramming::is_powerful); // ✔ ❓static_assert(( Template::Metaprogramming::is_easy Performance / Memory struct unpacked { char a; static_assert(sizeof(a) == 1u); // x86-64 int b; static_assert(sizeof(b) == 4u); // x86-64 char c; static_assert(sizeof(c) == 1u); // x86-64 }; 7 / 58[Examples]

关键字 static 关键字 final Java 应用与开发 面向对象编程进阶 PART2 王晓东 wangxiaodong@ouc.edu.cn 中国海洋大学 September 30, 2018 大纲 多态性 方法重载 关键字 static 关键字 final 学习目标 1. 理解多态和虚方法调用的概念，掌握其用法 2. 掌握方法重载的方法 3. 掌握 static 属性、方法和初始化块的用法 关键字的概念和使用方法 大纲 多态性 方法重载 关键字 static 关键字 final 大纲 多态性 方法重载 关键字 static 关键字 final 大纲 多态性 方法重载 关键字 static 关键字 final 接��� 多态性 方法重载 关键字 static 关键字 final 大纲 多态性 方法重载 关键字 static 关键字 final 什么是多态？ 在 Java Person 的子类 0x3a478b null 0 null name age school Student类型对象 Person类型变量p 大纲 多态性 方法重载 关键字 static 关键字 final 什么是多态？ 在 Java 中，子类的对象可以替代父类的对象使用称为多态。 O Java 引用变量与所引用对象间的类型匹配关系 ▶ 一个对象只能属于一种确定的数据类型，该类型自对象创建

tv_usec = 0; setitimer(ITIMER_REAL, &timer, 0); } A Typical performance evaluation static void flush_icache(void* begin, size_t size) { uintptr_t p = (uintptr_t)begin & ~15UL; for p += 16; } asm("isync"); } DataHeapType* getDataHeap() { static char buf[sizeof(DataHeapType)]; static DataHeapType* _theDataHeap = new (buf) DataHeapType; return _theDataHeap; tv_sec = 0; timer.it_interval.tv_usec = 0; setitimer(ITIMER_REAL, &timer, 0); } A static void flush_icache(void* begin, size_t size) { uintptr_t p = (uintptr_t)begin & ~15UL; size_t

we were in C# static List RemoveDead(List lst) { lst.RemoveAll(m => !m.IsAlive); return lst; } 26A word about beauty and elegance // if we were in C# static List IsAlive); return lst; } 27 Simple and nice…A word about beauty and elegance // if we were in C# static List RemoveDead(List lst) { lst.RemoveAll(m => !m.IsAlive); return lst; } and elegance // if we were in C# using System; using System.IO; using static System.Console; // recent C# class Program { static void Main() { Write(File.ReadAllText("z.cs")); } } 39A word about beauty

public value "value" 13 template struct TheAnswer { static constexpr int value = 42; };Return From a Metafunction • Expose a public value "value" • Expose public type "type" 13 template struct TheAnswer { static constexpr int value = 42; }; template struct IntIdentity { static constexpr int value = X; } static_assert(42 == IntIdentity<42>::value);Value Metafunctions

Button : public Canvas::View { public: static const char* const kText; static const char* const kBGColor; static const char* const kBorderColor; static const char* const kBorderWidth; // ... Button : public Canvas::View { public: static const char* const kText; static const char* const kBGColor; static const char* const kBorderColor; static const char* const kBorderWidth; // ... Button : public Canvas::View { public: static const char* const kText; static const char* const kBGColor; static const char* const kBorderColor; static const char* const kBorderWidth; // ...

casts can 4. Eliminate unintended errors 5. Make casting less enticingC++ casting operators* 1. static_cast 2. const_cast 3. dynamic_cast 4. reinterpret_cast *keywordsstatic_cast 1. Creates a f = static_cast(i); // 1 uint8_t ui8 = static_cast(1.75f * f); // 2 D d; B& rb = d; D& rd = static_cast(rb); //3 return 0; } void* some_c_handler(void* pv) { B* pb = static_cast(pv); return pb; }static_cast multiple hops struct A { explicit A(int){ puts("A");}}; struct E { operator int(){ puts("B::operator int"); return 0; } }; int main() { E e; A a = static_cast(e); return