std::vector<T,Allocator>:: C++ Containers library std::vector (1) iterator erase(iterator pos); (until C++11) iterator erase(const_iterator pos); (since C++11) (constexpr since C++20) (2) iterator erase(iterator first, iterator last);...
std::vector<T,Allocator>:: Create account Page Discussion Standard revision:DiffC++98/03C++11C++14C++17C++20C++23C++26 View Edit History C++ Containers library std::vector reference at(size_type pos); (1)(constexpr since C++20) const_reference at(size_type pos)const;...
note: say ‘typename std::vector<T*,std::allocator<T*> >::iterator’ if a type is meant 解决方案是使用关键字"typename",如前所述: 123 typename std::vector<T*>::iterator it = v.begin(); for( ; it != v.end(); ++it) { ... 相关讨论 您应该详细说明,这仅在T是模板参数时适用...
#5 0x557bafbcbc70 in std::_Vector_base<std::aligned_storage<32ul, 8ul>, std::allocator<std::aligned_storage<32ul, 8ul> > >::_Vector_base(unsigned long, std::allocator<std::aligned_storage<32ul, 8ul> > const&) /usr/include/c++/10/bits/stl_vector.h:305 #6 0x557bafbcb952 i...
STD::vector<bool, Allocator> &t,constunsignedint/* file_version */){// retrieve number of elementsunsignedintcount; ar >> BOOST_SERIALIZATION_NVP(count); t.clear();while(count-- >0){booli; ar >> boost::serialization::make_nvp("item", i); ...
template<class T, class A = allocator<T> > class vector ... Theallocatoris a class that supplies the functions used by the container to allocate and deallocate memory for its elements. In this tutorial, we assumed that we have a defaultallocatorand we will continue to assume this. For th...
However, it doesn’t check for out-of-bounds errors. If you access an index that’s outside the vector’s size, it leads to undefined behavior. Usingat() Theat()member function provides a safer way to access elements by checking the provided index against the vector’s size. ...
编辑:我又添加了两个基准,比较realloc与c数组的使用情况,reserve()与std::vector的使用情况。从最后的分析来看,realloc影响很大,即使只调用了30次。检查文档我想这是因为realloc可以返回一个全新的指针,复制旧的指针。为了完成这个场景,我还添加了用于在初始化期间完全分配数组的代码和图形。与reserve()的区别是有形的...