在STL中unique函数是一个去重函数, unique的功能是去除相邻的重复元素(只保留一个),其实它并不真正把重复的元素删除,是把重复的元素移到后面去了,然后依然保存到了原数组中,然后 返回去重后最后一个元素的地址,因为unique去除的是相邻的重复元素,所以一般用之前都会要排一下序。 若调用sort后,vector的对象的元素按次序排列如下:
也就是说项目的开发环境至少支持 std::shared_ptr、std::unique_ptr、std::weak_ptr 这几种智能指针...
在cpp reference中有如下说明: This function was deprecated in C++17 and removed in C++20 because use_count is only an approximation in multithreaded environment (see Notes in use_count) 可以理解,unique()本质上通过调用use_count()判断引用计数是否为1,而use_count()并不能提供unique()所代表的语义:...
unique函数 现在总结一下unique,unique的作用是“去掉”容器中相邻元素的重复元素(不一定要求数组有序),它会把重复的元素添加到容器末尾(所以数组大小并没有改变),而返回值是去重之后的尾地址,下面举个例子。 由于返回的是容器末尾,所以如果想得到去重后的size,需要减去初始地址,lower_bound是得到地址,稍微不同。 如...
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all the elements in the sequence that were not duplicates and hence not removed. // C++ program to demonstrate the use of std::unique#include<iostream>#include<algorithm>#include<string>usingnamespacestd;// Defining the BinaryFunctionboolPred(chara,charb){// Checking if both the arguments are...
undefined in this case See also adjacent_find finds the first two adjacent items that are equal (or satisfy a given predicate) (function template) unique_copy creates a copy of some range of elements that contains no consecutive duplicates ...
The member function swapsstored_ptrwithright.stored_ptrandstored_deleterwithright.stored_deleter. unique_ptr There are seven constructors forunique_ptr. C++ unique_ptr();unique_ptr(nullptr_t);explicitunique_ptr(pointer ptr);unique_ptr( Type* ptr,typenameconditional< is_reference<Del>::value, Del...
// BeginPrimaryKeyCpp#import"c:\program files\common files\system\ado\msadox.dll"no_namespace#import"c:\program files\common files\system\ado\msado15.dll"#include"iostream.h"#include"stdio.h"#include"conio.h"//Function DeclarationsinlinevoidTESTHR(HRESULT x){ifFAILED(x)_...
The member function swapsstored_ptrwithright.stored_ptrandstored_deleterwithright.stored_deleter. unique_ptr There are seven constructors forunique_ptr. C++ unique_ptr();unique_ptr(nullptr_t);explicitunique_ptr(pointer ptr);unique_ptr( Type* ptr,typenameconditional< is_reference<Del>::value, Del...