root@dev:/home/cu-lib/allocator# ./r.out in reader: src_ptr 0x1000: in reader: data_ptr:0x1040: src_ptr 0x1000: vec 0x1000 151in reader: vector size [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,...
在我的clang和libc++版本(靠近HEAD)中,这个static_assert通过: static_assert(std::is_copy_constructible_v<std::vector<std::unique_ptr<int>>>) 当然,如果您实际上试图复制-构造一个唯一指针的向量,它就无法编译: ../include/c++/v1/__memory/allocator.h:151:28: error: call to implicitly-deleted co...
// constructors used in the same order as described above:std::vector<int> first;// empty vectorstd::vector<int>second(4,100);// four ints with value 100std::vector<int>third(second.begin(),second.end());// iterating through secondstd::vector<int>fourth(third);// a copy of thir...
intmain(void){autoresult=GetMyClassVector(2);std::cout<<"==="<<std::endl;for(auto&obj:result){obj.PrintData();}return0;} 将上述代码复制到本地文件test.cpp中,可以直接通过如下命令进行编译: g++ test.cpp -otest 通过执行命令.\test运行该例程,可以得到如下结果: 由此,可以看出,得益于移动语义...
astd::vector<Thing> things, and then creating a function to add theThingto thevectorof things. However, when I do that, it seems as though theWorldobject creates its own copy of theThing, because when I change theThings position, the version of theThingin the things v...
std::copy是C++标准库中的一个算法函数,用于将一个范围内的元素复制到另一个范围内。它接受三个参数:源范围的起始迭代器、源范围的结束迭代器和目标范围的起始迭代器。std::copy函数会将源范围内的元素复制到目标范围内,并返回指向目标范围中最后一个复制元素之后的迭代器。 std::vector是C++标准库中的...
The first copy, or the vec1_c vector copies all eight elements, while the vec1_cc1 copies the first four elements from the original vector.Output:As we can see in the output above, both vec1_c and vec1_cc are displayed, which contain eight and four elements, respectively....
vector<int> ivec2(ivec1); //ok: copy elements ofivec1intoivec2 vector对象(以及其他标准库容器对象)的重要属性就在于可以在运行时高效地添加元素。 虽然可以对给定元素个数的vector对象预先分配内存,但更有效的方法是先初始化一个空vector对象,然后再动态地增加元素。
template<typenameT,typenameAlloc>cx_vector<T,Alloc>::cx_vector(std::initializer_list<T>list){start=Alloc::allocate(list.size());finish=std::uninitialized_copy(list.begin(),list.end(),start);end_of_storage=finish;} 在C++ 11 标准中提出了右值引用与移动语义的概念,借助它们我们可以消除对象之间...
C++ STL | Copying a vector: Learn - different ways to copy a vector in C++ STL, Shallow copy vs Deep copy, Different copy methods, etc.