下面的测试代码在GCC4.8(和4.7)下工作得很好:#includetemplatestructFunctor{templatestructInner{floatoperator()()const{return(object.*function)(args...);}};};classObject{public:floatsomeFunction(){return{};}floatsomeFunctionWithArgument(int){return{};}};Objectobject;Functor::templateInnerfunctor1;Functor::template

我正在尝试安装g++4.9或更高版本以便在Android上构建mapbox。说明说明我需要g++4.9或更高版本。我找到了以下说明，但它们不起作用。sudoadd-apt-repositoryppa:ubuntu-toolchain-r/testsudoapt-getupdatesudoapt-getinstallg++-4.9最后一条命令说:~$sudoapt-getinstallg++-4.9Readingpackagelists...DoneBuildingdependencytreeReadingstateinformation...DonePackageg++-4.9isno

如何根据bool字段对查询结果进行排序？考虑以下集合:{"_id":ObjectId("..."),"name":"John","isFoo":true}{"_id":ObjectId("..."),"name":"Jim","isFoo":false}{"_id":ObjectId("..."),"name":"Joel","isFoo":false}{"_id":ObjectId("..."),"name":"Jill","isFoo":true}{"_id":ObjectId("..."),"name":"Samantha","isFoo":true}我需要一个查询，该查询将首先

在gcc-4.9changes它说:UndefinedBehaviorSanitizer(ubsan),afastundefinedbehaviordetector,hasbeenaddedandcanbeenabledvia-fsanitize=undefined.Variouscomputationswillbeinstrumentedtodetectundefinedbehavioratruntime.UndefinedBehaviorSanitizeriscurrentlyavailablefortheCandC++languages.我查看了这个问题(AC++implemen

如标题所示，我有一个简短的演示程序，可以使用所有这些编译器进行编译，但在使用gcc4.8和gcc4.9编译后运行时核心转储:有什么想法吗？#includestructFoo:std::unordered_map{usingstd::unordered_map::unordered_map;//~Foo()=default;//addingthisallowsittowork};structBar{Bar(Foof={}):_f(std::move(f)){}//usinganyofthefollowingconstructorsfixestheproblem://Bar(Foof=Fo

如标题所示，我有一个简短的演示程序，可以使用所有这些编译器进行编译，但在使用gcc4.8和gcc4.9编译后运行时核心转储:有什么想法吗？#includestructFoo:std::unordered_map{usingstd::unordered_map::unordered_map;//~Foo()=default;//addingthisallowsittowork};structBar{Bar(Foof={}):_f(std::move(f)){}//usinganyofthefollowingconstructorsfixestheproblem://Bar(Foof=Fo