I have a program where multiple threads share the same data structure which is basically a 2D array of vectors and sometimes two or more threads might have to insert at the same position ie vector which might result in a crash if no precautions were taken. What is the fastest and most efficient way to implement a safe solution for this issue ? Since this issue does not happen very often (no hig
我有一个程序，其中多个线程共享相同的数据结构，该数据结构基本上是一个2D矢量阵列，有时两个或更多线程可能不得不在相同位置插入，即如果没有采取预防措施可能导致崩溃的向量。 为此问题实施安全解决方案的最快和最有效的方式是什么？ 由于这个问题不经常发生（没有很高的争用），我有一个二维数组互斥体，每个互斥体映射到一个向量，然后每个线程锁定，然后在更新相应向量完成后解锁互斥体。 如果这是一个很好的解决方案，
I would like to setup a default C and C++ compiler when building Python extensions under Linux. I noticed the --compiler option to python setup.py build, but I am wondering if there is a way of setting this as an environmental variable so that I can specify them just once. It's not possible to use an environment variable, but you can create a setup.cfg file. See Writing the Setup Configur
在Linux下构建Python扩展时，我想设置一个默认的C和C ++编译器。 我注意到了python setup.py build的--compiler选项，但是我想知道是否有将这个设置为环境变量的方法，以便我可以只指定它们一次。 无法使用环境变量，但可以创建setup.cfg文件。 请参阅编写安装配置文件。 以下setup.cfg文件将尝试使用Intel C编译器： [build_ext] compiler=icc
I'm targeting Windows but I don't see any reason why some API code I'm writing cannot use basic C++ types. What I want to do is expose methods that return strings and ints. In the C# world I'd just use string, and have a unicode string, but in VC++ I've got the option of using std::string, std::wstring, or MFC/ATL CStrings. Should I just use std::wstring exclusively to sup
我针对的是Windows，但我没有看到任何理由说明我正在编写的一些API代码不能使用基本的C ++类型。 我想要做的是公开返回字符串和整数的方法。 在C＃世界中，我只是使用字符串，并有一个Unicode字符串，但在VC ++中，我可以选择使用std :: string，std :: wstring或MFC / ATL CString。 我应该只使用std :: wstring来支持unicode，还是我可以使用std :: string，它会根据我的编译设置编译为unicode？ 我倾向于后者。 我更喜
There are a lot of solutions for restricting an application from running twice. Searching by process name, using a named mutex etc. But I all of these methods don't work if I want to restrict my application to the shell session. A user may have more than login session and shell on windows (right?)? If this is true I want to be able to run one instance of my application in every shell sess
有很多限制应用程序运行两次的解决方案。 按进程名称进行搜索，使用命名互斥锁等。但是，如果我想将应用程序限制在shell会话中，所有这些方法都不起作用。 用户可能在Windows上拥有超过登录会话和shell（对吧？）？ 如果这是真的，我希望能够在每个shell会话中运行我的应用程序的一个实例，但只允许一个。 有没有办法获得一个shell标识符，然后可以将其放入互斥体名称中？ 您可以创建本地（仅限会话）或全局（整个系统）
question might be related to: Using boost graph library: how to create a graph by reading edge lists from file however the answer did not really help me. I want to create a graph using boost's adjacency_list class. The data is in a .txt file with two columns. Sample: 5 14 7 2 3 18 21 207 ... It would be great if I could just do the following: std::ifstream data("data.txt"); typedef
问题可能与以下方面有关：使用boost图库：如何通过从文件中读取边列表来创建图 然而，答案并没有真正帮助我。 我想用boost的adjacency_list类创建一个图。 数据位于带有两列的.txt文件中。 样品： 5 14 7 2 3 18 21 207 ... 如果我能够做到以下几点，那将是非常棒的： std::ifstream data("data.txt"); typedef adjacency_list<> Graph; Graph g; while (data >> nodeA >> nodeB){ add_edge(node
I was wondering how the property maps are implemented in a boost Graph. For example, I have vertex and edge properties defined like this: //vertex property:--> struct NodeInfo { int a , b , c; }; //actual bundled property struct NodeInfoPropertyTag { // tag and kind (as in boost documentation) typedef boost::vertex_property_tag kind; static std::size_t co
我想知道如何在增强图中实现属性映射。 例如， 我有像这样定义的顶点和边的属性： //vertex property:--> struct NodeInfo { int a , b , c; }; //actual bundled property struct NodeInfoPropertyTag { // tag and kind (as in boost documentation) typedef boost::vertex_property_tag kind; static std::size_t const num; }; std::size_t const NodeInfoPropertyTag::num = (
I trying to use boost::variant std::vector<boost::variant<mesh::Entity&, mesh::Vertex, mesh::Edge> > xField::getZeros(const mesh::Region& s, char *EntityS) const { //Vertex if( EntityS == "V" ) { std::vector<mesh::Vertex> zeros; for(Region::vertexIterator itv = s.beginVertex(); itv != s.endVertex(); ++itv ) { if( abs(getVal(*itv)) &
我试图使用boost :: variant std::vector<boost::variant<mesh::Entity&, mesh::Vertex, mesh::Edge> > xField::getZeros(const mesh::Region& s, char *EntityS) const { //Vertex if( EntityS == "V" ) { std::vector<mesh::Vertex> zeros; for(Region::vertexIterator itv = s.beginVertex(); itv != s.endVertex(); ++itv ) { if( abs(getVal(*itv)) <
I use Boost Graph Library in a project and it is declared as: typedef adjacency_list <listS, listS, undirectedS, TrackInformation, LinkInformation> TracksConnectionGraph; Things are going fine until I have to call connected_components on my graph. typedef std::map<TracksConnectionGraph::vertex_descriptor, TracksConnectionGraph::vertices_size_type> component_type; component_type com
我在项目中使用Boost Graph Library，它被声明为： typedef adjacency_list <listS, listS, undirectedS, TrackInformation, LinkInformation> TracksConnectionGraph; 直到我必须在我的图上调用connected_components之前，情况才会好转。 typedef std::map<TracksConnectionGraph::vertex_descriptor, TracksConnectionGraph::vertices_size_type> component_type; component_type component; boost::associative
I'm writing a library for manipulating bond graphs, and I'm using the Boost Graph Library to store the data for me. Unfortunately, I can't seem to figure out how to implement a proper visitor pattern using it, as you can't subclass out vertices - you must rely on 'properties' instead. The visitor framework provided in the library seems heavily geared towards working with
我正在编写一个操作债券图的库，我正在使用Boost图库为我存储数据。 不幸的是，我似乎无法弄清楚如何使用它来实现适当的访问者模式，因为您不能将顶点分类 - 您必须依靠“属性”来代替。 在库中提供的访问者框架似乎非常适合于某些顶点都是相同类型的算法，但存储不同的信息。 在我的问题中，顶点是不同类型的，存储不同类型的信息 - 有些顶点是电阻，有些则是电容等。我该如何去写一个基于顶点属性的访问模式，而不是顶点本身
I wrote a .cpp file shown below int main() { int a, b; scanf( "%d", &b ); for ( int i = 0 ; i < 1000 ; i++ ) { a = 0; if ( b > 10 ) a = 3; } return a; } then I compiled this code by clang with -O3 option, the output .ll file is define i32 @main() #0 { entry: %b = alloca i32, align 4 %call = call i32 (i8*, ...)* @scanf(i8* getelementptr inbounds ([3 x i8]*
我写了一个如下所示的.cpp文件 int main() { int a, b; scanf( "%d", &b ); for ( int i = 0 ; i < 1000 ; i++ ) { a = 0; if ( b > 10 ) a = 3; } return a; } 然后我通过使用-O3选项的clang编译此代码，输出.ll文件为 define i32 @main() #0 { entry: %b = alloca i32, align 4 %call = call i32 (i8*, ...)* @scanf(i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i