std::transform应用给定的函数到某个/些输入范围中的元素,并将结果存储到从d_first开始的输出范围。 1)应用一元函数unary_op到[first1,last1)中的元素。 如果unary_op使以下某个范围中的某个迭代器失效,或者修改了以下某个范围中的某个元素,那么行为未定义: ...
std::transformdoes not guarantee in-order application ofunary_oporbinary_op. To apply a function to a sequence in-order or to apply a function that modifies the elements of a sequence, usestd::for_each. Example Run this code Output: ...
1)等价于transform_reduce(first1, last1, first2, init, std::plus<>(),std::multiplies<>()),实际上是默认的std::inner_product的等效并行版本。 3)应用transform到来自范围[first1,last1)和从first2开始的包含std::distance(first1, last1)个元素的范围的每对元素,并在reduce上与初始值init一同规约各...
#include <functional>#include <iostream>#include <iterator>#include <numeric>#include <vector>intmain(){std::vectordata{3,1,4,1,5,9,2,6};autotimes_10=[](intx){returnx*10;};std::cout<<"10 times exclusive sum: ";std::transform_exclusive_scan(data.begin(), data.end(),std::ostrea...
本文中的代码 ,std::suspend_never initial_suspend() {return {}} 表示协程立即启动,如果换成 std::suspend_always ,协程将不会启动,上面的代码将不会有任何输出。这两个promise的类型将在下文分析。 当co_await promise.initial_suspend() 恢复时,开始协程的执行。 总结成伪代码就是: task resuming_on_new...
Sum { Sum() { sum = 0; } void operator()(int n) { sum += n; } int sum; }; int main() { std::vector<int> nums{3, 4, 2, 9, 15, 267}; std::cout << "до: "; for (auto n : nums) { std::cout << n << " "; } std::cout << '\n'; std::for_each(...
/usr/bin/ld: CMakeFiles/rtabmap_wifi_signal_sub.dir/src/WifiSignalSubNode.cpp.o: in function `mapDataCallback(boost::shared_ptr<rtabmap_msgs::MapData_<std::allocator<void> > const> const&)': WifiSignalSubNode.cpp:(.text+0x15e2): undefined reference to `rtabmap::util3d::transformPo...
undefined reference to `std::__cxx11::basic_string<char, 2019-11-13 09:41 − centos上编译报错,部分信息如下: /usr/local/lib/libprotobuf.so.9: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::al... luku 0 30754 解决错误 undefined referenc...
constexprunary_transform_result<I, O> transform(I first1, S last1, O result, F op, Proj proj={}); (1)(since C++20) template<ranges::input_rangeR,std::weakly_incrementableO, std::copy_constructibleF,classProj=std::identity> requiresstd::indirectly_writable<O, ...
{'A','B','C','D','E'};std::vector<char>v2{'E','D','C','B','A'};std::vector<bool>v3(v1.size());std::transform(v1.begin(), v1.end(), v2.begin(), v3.begin(),std::not2(same()));std::cout<<std::boolalpha;for(std::size_ti=0;i<v1.size();++i)std::...