我刚接触过vue,但我不明白为什么没有人能回答这个问题。我本以为这很简单,但我找不到任何地方谈论它。我有一个getCategory方法,它使用阿波罗查询我们的graphQL API。逻辑如下所示:
import { useQuery, useResult } from "@vue/apollo-composable";
import * as getCategoryBySlug from "@graphql/api/query.category.gql";
export function useGetCategory(slug: str
我正在尝试用c++制作汤普森的构造算法(我对该语言有点陌生)。但是,在为类NFiniteAutomaton实现析构函数方面,我遇到了一些困难。在NFiniteAutomaton构造函数的某些部分中,我有:
NFiniteAutomaton() = default;
NFiniteAutomaton(std::string regex){
// A lot of code here
// ....
NFiniteAutomaton single_ele;
single_ele.init_state = new State;
single_ele.fina
给定一个代码(真正的伪代码):
struct A { /* ... */ }; // assume is non-trivial
struct B { /* ... */ }; // assume is non-trivial
using UA = std::unique_ptr< A >;
using UB = std::unique_ptr< B >;
union U
{
UA a;
UB b;
};
U u{std::make_unique< A >(/* init */)};
u.a = nullptr; // destru
在“加速C++”的第11章中,作者提出了一个用数组模拟std::向量行为的向量类。他们使用分配程序类来处理内存管理。uncreate函数的作用是销毁数组的每个元素并释放分配给数组的空间:
template <class T> void Vec<T>::uncreate() {
if (data) {
// destroy (in reverse order) the elements that were constructed
iterator it = avail;
while (it != data)
alloc.destroy(--it
在本例中链接..。
我发现了一些章节,比如,~ImprovedClass() ~Inner()
请帮帮我,他们是什么?为什么和如何在代码中使用它们?
class Inner
{
public Inner(IntPtr unkOuter)
{
}
~Inner()
{
}
}
public class Improv
以下节目:
#include <iostream>
using namespace std;
class Test
{
public:
Test() { cout << "Constructor is executed\n"; }
~Test() { cout << "Destructor is executed\n"; }
};
int main()
{
Test(); // Explicit call to constructor
Test t; // local object
我这里有个密码:
getData(value, index) {
const {responseMetadata, responseData} = this.getResponseDatum();
return responseData.get(index).get('code').toUpperCase();
}
eslint报告了一个错误:
19:12 "responseMetadata" is defined but never used
在python中,我可以通过将变量重命名为_responseMetadata来避免这种
char * buf = new char[sizeof(T)];
new (buf) T;
T * t = (T *)buf;
//code...
//here I should destruct *t but as it is argument of template and can be
//instantiated via basic types as well (say int) so such code
/*t->~T();*/
//is incorrect (maybe correct? Strange, but it works on VS 2005 for basic
假设这个类定义正在工作
TStringListNF = class (TStringList)
procedure TestContenu (verif : Boolean);
destructor DestroyList;
destructor DestroyListFree;
end;
并且这个类的类体也在工作。
destructor TStringListNF.DestroyList;
{//Verified 27 june 98}
var
i : Integer;
tempItem : TObject;
begin
for i:= 0 to Count-1 do
我试着理解在退出范围时析构函数调用的顺序。假设我有以下代码:
class Parent{
Parent(){cout<<"parent c called \n";}
~Parent(){cout<< "parent d called \n";}
};
class Child: public parent{
Child(){cout<< "child c called \n";}
~Child(){cout<<"child d called\n";}
};
现在,我知道子构造函数