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xtree(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false...
...\Microsoft Visual Studio 11.0\VC\include\xtree(1775): 参见对正在编译的函数 模板 实例化“std::pair<_Ty1,_Ty2> std::_Tree<_Traits>::_Insert_nohint<std::pair<const _Kty,_Ty>&,_Nodety>(bool,_Valty,_Nodety)”的引用
1> with
1> [
1> _Ty1=std::_Tree_iter...
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...
Rename a class in Xcode: Refactor… is grayed out (disabled). Why?
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If you are using Objective-C++ (i.e. mix Objective-C with C++ code) then refactoring is disabled in xcode since it does not support refactoring of C++ code.
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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...
Appending a vector to a vector [duplicate]
...lly applicable solution, as b could also be an array. However, it requires C++11. If you want to work with user-defined types, use ADL:
using std::begin, std::end;
a.insert(end(a), begin(b), end(b));
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How to redirect cin and cout to files?
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If the answers were equal in functionality, the C++ equivalent of this would be ofstream out("out.txt"); cout.rdbuf(out.rdbuf()); - only one extra line, and it's portable. Not soooo much simpler :)
– nevelis
Jul 19 '17 at 3:03
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Reading from text file until EOF repeats last line [duplicate]
The following C++ code uses a ifstream object to read integers from a text file (which has one number per line) until it hits EOF . Why does it read the integer on the last line twice? How to fix this?
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