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编译错误 error: ISO C++ forbids declaration of ‘xxx’ with no type [-...
编译错误 error: ISO C++ forbids declaration of ‘xxx’ with no type [-fpermissive]error-iso-c-forbids-declaration-of-with-no-type比较可能的情况1：函数没有写返回类型，加上返回类型后编译成功。 ifndef ttTree_h define ttTree_hclass ttTree {public: ttTree(void); int ...
C++: const reference, before vs after type-specifier
...& (and const T*):
const T& is the style used in Stroustrup's The C++ Programming Language book.
const T& is the style used in the C++ standard itself.
const T* is the style used in K&R's The C Programming Language book.
const T* is the style used in the C standard.
Due to the above...
c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
...tainer stuff and have a rather in-depth question that hopefully a boost or C++ container expert might know (my knowledge in C++ containers is pretty basic). For reference, the boost documentation on composite keys can be found here: boost::multi_index composite keys.When using a composite key, the d...
Where do I find the current C or C++ standard documents?
... standard
As of 1st September 2014, the best locations by price for C and C++ standards documents in PDF are:
C++17 – ISO/IEC 14882:2017: $116 from ansi.org
C++14 – ISO/IEC 14882:2014: $90 NZD (about $60 US) from Standards New Zealand
C++11 – ISO/IEC 14882:2011: $60 from ansi.org $60 from T...
What is the difference between an int and a long in C++?
...s whereas an int was 32 bits. This article covers the rules for the Intel C++ compiler on variable platforms. To summarize:
OS arch size
Windows IA-32 4 bytes
Windows Intel 64 4 bytes
Windows IA-64 4 bytes
Linux IA-32 4 byte...
腾讯Tencent开源框架介绍（持续更新） - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...rce腾讯开源了很多自己内部久经考验的框架代码，这里对C++及大前端相关的开源框架进行一些探索，有类似需求的可以参考一下。GitHub：https: github com Tencent官网：https: openso 腾讯开源了很多自己内部久经考验的框架代码，这...
Forward declaration of nested types/classes in C++
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You can't do it, it's a hole in the C++ language. You'll have to un-nest at least one of the nested classes.
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Simple example of threading in C++
...someone post a simple example of starting two (Object Oriented) threads in C++.
7 Answers
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How to initialize a vector in C++ [duplicate]
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With the new C++ standard (may need special flags to be enabled on your compiler) you can simply do:
std::vector<int> v { 34,23 };
// or
// std::vector<int> v = { 34,23 };
Or even:
std::vector<int> v(2);
v = { 34,23 ...
How should I detect unnecessary #include files in a large C++ project?
I am working on a large C++ project in Visual Studio 2008, and there are a lot of files with unnecessary #include directives. Sometimes the #include s are just artifacts and everything will compile fine with them removed, and in other cases classes could be forward declared and the #include could...