#include <limits.h> #include <stdio.h> #include <algorithm> #include <iostream> #include #include <string> #include <utility> #include <vector> using namespace std; class Solution { public: Solution(): id_(0) { cout << "Default Constructor:id=" << id_ << " addr=:" << this ...
#include<vector>#include<memory>classMyClass{public:MyClass(){}~MyClass(){std::cout<<"Destructor called"<<std::endl;}};std::vector<std::unique_ptr<MyClass>>createObjects(){std::vector<std::unique_ptr<MyClass>>objects;objects.push_back(std::make_unique<MyClass>());returnobjects;// ...
return :表示从被调函数返回到主调函数继续执行,返回时可附带一个返回值,由return后面的参数指定。 return通常是必要的,因为函数调用的时候计算结果通常是通过返回值带出的。 如果函数执行不需要返回计算结果,也经常需要返回一个状态码来表示函数执行的顺利与否(-1和0就是最常用的状态码),主调函数...
#include <iostream>#include<vector>usingnamespacestd;voidvectorPrinter(vector<int>::iterator beg, vector<int>::iterator end) {if(beg !=end) { cout<< *beg <<endl; vectorPrinter(beg+1, end);return; }elsereturn; }intmain() { vector<int> ivec = {1,2,3,4,5}; vectorPrinter(begin(...
因为漏写了一个return语句,g++又没开warning,结果就悲剧了,调用的时候出现了奇怪的现象,于是就测试了一把到底没写return的时候返回什么东西。 #include <iostream> #include <vector> using namespace std;boolfunc(){inti=10; i++; }intmain() {boola =func();boolb=true;boolc=100; ...
函数的返回值不能是数组或函数类型,但可以是指向数组或函数的指针 6.1.1 作用域,局部对象 函数体是一个块,构成一个新的作用域,其中定义的变量和形参都是局部变量 在函数体外部定义的对象存在于程序的整个执行过程中 自动对象: 只存在于块执行期间的对象,例如形参,函数终止,形参会被销毁,局部变量如果本身不带初始...
Non-scalar types including floats, doubles, and vector types such as __m128, __m128i, __m128d are returned in XMM0. The state of unused bits in the value returned in RAX or XMM0 is undefined.User-defined types can be returned by value from global functions and static member functions...
virtualstd::vector<int>&fun(){staticstd::vector<int>unused;returnunused;} 但这个很不符合 C++ 的一贯作风耶———既然不用就不要声明! 2. 返回指针,而不是引用。可以让基类返回 nullptr。 classBase{public:virtualstd::vector<int>*fun(){returnnullptr;}};classDerived:publicBase{private:std::vector...
The Link Register (LR/R14) is then updated to a special value to be used during exception return (EXC_RETURN, to be introduced later in this chapter, Section 8.7), and then the exception vector is automatically located from the vector table and the exception handler starts to execute. At ...
最后试着用上面的配置器(allocator、constructor和uninitialized)写一个简单的vector容器: /*vector.h*/#include<memory>#include"my_alloc.h"#include"my_construct.h"template<classT,classAlloc=alloc>classvector {public: typedef T value_type; typedef T*pointer; ...