#include <iostream> #include <vector> #include <functional> int main() { int number1 = 42; int number2 = 73; std::vector<std::reference_wrapper<int>> numbers = {std::ref(number1), std::ref(number2)}; for (auto& num : numbers) { num.get() += 10; // 修改原始对象的值 }...
(accumulator_function2, std::ref(v), std::ref(acm1), 0, v.size() / 2);,对应的函数实现为void accumulator_function(const std::vector<int> &v, ULL &acm, unsigned int beginIndex, unsigned int endIndex),该函数的参数为一个vector引用、一个计算结果acm的引用和记录vector首末位置...
int a = 123; auto ref_a = std::ref(a); int& raw_ref = ref_a.get(); // 显式获取 int& 1|3典型使用场景 将引用存储在容器中 int main() { int a = 1, b = 2, c = 3; cout << " " << a << " " << b << " " << c << "\n"; // 1 2 3 std::vector<std...
这里使用的是哪个std::vector构造函数? 什么是SELF JOIN以及何时使用它? 如何知道c++中的std::thread何时结束? 如何使用ref ref React数组将ref传递给孩子的孩子? 理解malloc()何时是必要的:我知道编译时char *n的长度,但似乎仍然需要malloc() 页面内容是否对你有帮助?
bool great_than(int first,int second) { return first > second; } std::vector<int> data = {1,2,3,4,5}; //找到第一个大于3的元素 auto it = std::find_if(std::cbegin(data),std::cend(data),std::bind(great_than,std::placeholders::_1,3)); 考虑如下代码,实现了一个函数func在函...
get(); } if (dispatcher) { // OSG_NOTICE<<" returning dispatcher="<<dispatcher<<std::endl; dispatcher->assign(array->getDataPointer()); return dispatcher; } else { // OSG_NOTICE<<" no dispatcher found"<<std::endl; return 0; } } typedef std::vector< ref_ptr<AttributeDispatch> >...
std::vector是C++的默认动态数组,其与array最大的区别在于vector的数组是动态的,即其大小可以在运行时更改。std::vector是封装动态数组的顺序容器,且该容器中元素的存取是连续的。
std::vector Defined in header<vector> template< classT, classAllocator=std::allocator<T> >classvector; (1) namespace { template<classT> usingvector=std::vector<T,std::pmr::polymorphic_allocator<T>>; } (2) (since C++17) 1)std::vectoris a sequence container that encapsulates dynamic siz...
#include <iostream>#include<functional>//for std::cref/std::ref#include <vector>#include<list>#include<numeric>//std::iota#include <random>voidf(int& n1,int& n2,constint&n3) { std::cout<<"In function:"<< n1 <<''<< n2 <<''<< n3 <<std::endl;++n1;//函数对象的n1副本++n2;...
std::vector<std::shared_ptr<std::thread>> philosopher; std::vector<std::mutex> tableware_mutex(5); for (int loop_i = 0; loop_i < 5; ++loop_i) { philosopher.push_back( std::make_shared<std::thread>(thread_func, loop_i, std::ref(tableware_mutex[loop_i]), std::ref(tableware...