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When should I use the Visitor Design Pattern? [closed]
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1) My favourite example is Scott Meyers, acclaimed author of “Effective C++”, who called this one of his most important C++ aha! moments ever.
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The modulo operation on negative numbers in Python
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Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as the denominator (divisor). Your expression yields 3 because
(-5) / 4 = -1.25 --> floor(-1.25) = -2
(-5) % 4 = (-2 × 4 + 3) % 4 = 3.
It is...
How do you create a static class in C++?
How do you create a static class in C++? I should be able to do something like:
13 Answers
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How to convert a char array to a string?
Converting a C++ string to a char array is pretty straightorward using the c_str function of string and then doing strcpy . However, how to do the opposite?
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Markup XML解析库下载（Markup.h 和 Markup.cpp） - 源码下载 - 清泛网 - 专注C/C++及内核技术
...kup XML解析库下载（Markup.h 和 Markup.cpp）Markup CMarkup XML解析C++编写的，一个 h，一个 cpp，绿色小巧，直接加入工程源码编译，跨平台。使用方法参见《C++ 读写xml方法整理（持续更新）》Markup h M C++编写的，一个.h，一个.cpp，绿...
How do you tell the Visual Studio project type from an existing Visual Studio project
....vproj file defines the project type, for example, the following defines a C++ project.
<VisualStudioProject
ProjectType="Visual C++"
The project tag also includes the compiler version.
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Performant Entity Serialization: BSON vs MessagePack (vs JSON)
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Implementation and API design
MessagePack has type-checking APIs (Java, C++ and D)
MessagePack supports static-typing.
Dynamic-typing used with JSON or BSON are useful for dynamic languages like Ruby, Python or JavaScript. But troublesome for static languages. You must write boring type-checkin...
Are the shift operators () arithmetic or logical in C?
...tation-dependent for right shifts of signed values.
Wikipedia says that C/C++ 'usually' implements an arithmetic shift on signed values.
Basically you need to either test your compiler or not rely on it. My VS2008 help for the current MS C++ compiler says that their compiler does an arithmetic shi...
Why doesn't delete set the pointer to NULL?
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Stroustrup himself answers. An excerpt:
C++ explicitly allows an
implementation of delete to zero out
an lvalue operand, and I had hoped
that implementations would do that,
but that idea doesn't seem to have
become popular with implementers.
But the mai...
error: passing xxx as 'this' argument of xxx discards qualifiers
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Actually the C++ standard (i.e. C++ 0x draft) says (tnx to @Xeo & @Ben Voigt for pointing that out to me):
23.2.4 Associative containers
5 For set and multiset the value type
is the same as the key type. For map
and multimap...