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Transitivity of Auto-Specialization in GHC

... "is the auto-specialization transitive?" Should I only expect (+) to be specialized transitively with an explicit pragma? (apparently intended) Is this a bug of GHC? Is it inconsistent with the documentation? AFAIK, the answers are No, mostly yes but there are other means, and No. Co...
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Convert generator object to list for debugging [duplicate]

When I'm debugging in Python using IPython, I sometimes hit a break-point and I want to examine a variable that is currently a generator. The simplest way I can think of doing this is converting it to a list, but I'm not clear on what's an easy way of doing this in one line in ipdb , since I'm so n...
https://www.tsingfun.com/ilife/relax/715.html 

千万别惹程序员 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术

...瑞士军刀,说明是用来做细活的工具。C语言的刀上有个USB,说明是可以做硬件操作的。C++的刀是什么都有,说明C++是一种功能繁多的语言。(图中C++的那把瑞士军刀很强大,不要以为其是虚构的,这把刀是真实存在的,叫Wenger...
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代码坏味道(总结) - C/C++ - 清泛网 - 专注C/C++及内核技术

...次一起出现,这时应该提取数据结构。 9.Primitive Obsession(基本类型偏执) 使用过多的基本数据类型,这时应该提取数据结构。 10.Switch Statements(switch惊悚现身) 不要过多使用switch,可以考虑用多态代替。 1...
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C++ template中typename和class的区别 - C/C++ - 清泛网 - 专注C/C++及内核技术

...ame 去标识 nested dependent type names(嵌套依赖类型名),在 base class lists(基类列表)中或在一个 member initialization list(成员初始化列表)中作为一个 base class identifier(基类标识符)时除外。 For example: using namespace std; template...
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C++11 tuple 这一篇就够了 - C/C++ - 清泛网 - 专注C/C++及内核技术

...成一个元素类型全是引用的tuple,相当于make_tuple(ref(a),ref(b),…)。可以通过tie()函数的使用方便的对tuple进行“解包”操作。看下面的代码: #include <iostream> #include <tuple> int main () { int myint; char mychar; float myfloat; std::tu...
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解决:无法通过windows installer服务安装此安装程序包。您必须安装带有更...

...ller: http://www.microsoft.com/downloads/zh-cn/details.aspx?FamilyID=5a58b56f-60b6-4412-95b9-54d056d6f9f4 安装后,问题解决。 windows installer
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stdbool.h C99标准杂谈 - C/C++ - 清泛网 - 专注C/C++及内核技术

stdbool.h C99标准杂谈include <stdbool.h> 找不到头文件???bool 是C++中的关键字,C中不支持所以C99标准中引入了头文件 stdbool.h,包含了四个用于布尔型...include <stdbool.h> 找不到头文件??? bool 是C++中的关键字,C中不支持 所以C99...
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C语言面试那些事儿──一道指针与数组问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

...。 为方便讨论,先开始理解如下关系: 以下是某次在Ubuntu 10.10-desktop-i386 + gcc 4.4.5的运行结果: size of a: 20 (bytes) (Why? 因为机器是32位的, size of int 为 4 bytes,a有5个int) size of ptr: 4 (bytes) (ptr是指针,永远不要忘记,32位字长...
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“非常量引用的初始值必须为左值”原因分析及解决 - C/C++ - 清泛网 - 专注...

...: int& a = 5; //错误 const int& a = 5; //正确 int a = 5; int& b = a; //正确 左值和右值都是针对表达式而言的,左值是指表达式结束后依然存在的持久对象,右值是指表达式结束时就不再存在的临时对象。一个区分左值与右值的便...