std :: vector构造函数不为每个元素调用对象构造函数吗?
My code resembles something along these lines. 我的代码类似于这些内容。 class A{ public: A(int i) { printf("hello %d\n", i); } ~A() { printf("Goodbye\n"); ...
C++11 std::function用法
转自 http://www.hankcs.com/program/cpp/c11-std-function-usage.htmlfunction可以将普通函数,lambda表达式和函数对象类统一起来。它们并不是相同的类型,然而通过function模板类,可以转化为相同类型的对象(function对象...
'std :: map':'SomeClass'不是参数'_Ty'的有效模板类型参数
I currently have a class that looks like the following . 我目前有一个类如下所示。 #define SET_METHOD( t , n ) \private: t n; \public: void set_##n( t v...
用BOOST_FOREACH std::地图
I'd like to iterate over a std::map using BOOST_FOREACH and edit the values. I can't quite get it. 我想使用BOOST_FOREACH迭代std::map并编辑值。我不太明白。 typedef std:...
如何使用BOOST_FOREACH和两个std :: maps?
I have code that looks essentially like this: 我的代码看起来基本上是这样的: std::map<int, int> map1, map2;BOOST_FOREACH(int i, map1){ // do steps 1-5 here....
STL STD::list使用说明
stl list使用说明 使用标准的std::list进行容器数据处理时,操作比较底层。我们可以,减少引用标准MFC标准库,减少系统的大小,但同时也存在有不方便的操作之处,这里同大家分享一些使用心得...... 在使用std::list<>链表时,难免会对...
c++ std::队列::流行()调用析构函数。指针的类型是什么?
I have a std::queue that is wrapped as a templated class to make a thread-safe queue. I have two versions of this class: one that stores value types, ...
Linker错误:未定义的“std::ctype::_M_widen_init()来自静态的lib,即使是相同的gcc版本。
I am getting error which can be seen below, error is coming from a static library which I created(libredis.a) : 我的错误可以在下面看到,错误来自于我创建的一个静态库(libredisa)...
Linux gcc编译之-std选项
用GCC编译代码时候后面带有-std=c++1z 的选项,这是指定c/c++的标准.具体的标准如下,详细信息可以看引用里面的详细说明...
centos升级gcc到4.8.2(cc1plus: 错误:无法识别的命令行选项“-std=c++11”)
本文使用操作系统:Centos 6.4 Desktop,64bit; 原GCC版本:4.4.7; 目标:升级GCC到4.8.2,以支持C++11。 获取GCC 4.8.2包:wget http://gcc.skazkaforyou.com/releases/gcc-4.8.2/gcc-4.8.2.t...
centos升级gcc到4.8.2(cc1plus: 错误:无法识别的命令行选项“-std=c++11”)
本文使用操作系统:Centos 6.4 Desktop,64bit; 原GCC版本:4.4.7; 目标:升级GCC到4.8.2,以支持C++11。 获取GCC 4.8.2包:wget http://gcc.skazkaforyou.com/releases/gcc-4.8.2/gcc-4.8...
std::原子工作合适吗?
I am reading through Anthony Williams' "C++ Concurrency in Action" and in Chapter 5, which talks about the new multithreading-aware memory model and a...
使用c++(我的地方。e std::string) string(字符串)and where to use '\0' ending c string [duplicate]
This question already has an answer here: 这个问题已经有了答案: What's the rationale for null terminated strings? 16 answers 空终止字符串的基本原理是什么?16个问题 Wh...
在std::string中存储unicode UTF-8字符串
In response to discussion in 作为对In的讨论的回应 Cross-platform strings (and Unicode) in C++ c++中的跨平台字符串(和Unicode) How to deal with Unicode strings in C/C++ ...
utf - 16编码/解码std::string
I have to handle a file format (both read from and write to it) in which strings are encoded in UTF-16 (2 bytes per character). Since characters out o...
为什么'nullptr'不在'std'命名空间中?
It seems that nullptr is declared in the default global namespace. Wouldn't it make sense for it to be in the std namespace? 似乎nullptr是在默认的全局名称空间中声明的。...
条款23:理解std::move和std::forward
通过了解std::move和std::forward不做什么来理解它们很有用。std::move不移动任何东西,std::forward也不转移任何东西。在运行时(runtime),他们什么都不做,一行代码也不产生。 std::move和std::forward仅仅是进行类型转换的函数(实际上是函数...
如何通过std::sort对数组排序?
I have such array: 我有这样的数组: long my_array_left[n][2]; I wrote comparator function for it, which takes array of two elements and sort by first element ...
std::vector存储指针后深拷贝的问题
class CPoolLine {private: double m_max_x;double m_min_x;double m_max_y;double m_min_y;u...
浅谈 C++ 模板 & 泛化 (妈妈再也不用担心我不会用 std::sort 了)
先上个对 int 类型数组的插入排序:void insertionSort_01(int* seq, int firstIndex, int lastIndex) { for (int j = firstIndex + 1; j <= lastIndex; ++j) { i...