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2021年最新整理， C++ 学习资料，含C++ 11 / 14 / 17 / 20 / 23 新特性、入门教程、推荐书籍、优质文章、学习笔记、教学视频等

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cpp_new_features's Issues

7.7 指针和函数输出最好修改一下哟

`int main() {

int a = 10;
int b = 20;
swap1(a, b); // 值传递不会改变实参

swap2(&a, &b); //地址传递会改变实参

cout << "a = " << a << endl;

cout << "b = " << b << endl;

system("pause");

return 0;

}修改成这样子会不会更好点呢？int main() {

int a = 10;
int b = 20;
swap1(a, b); // 值传递不会改变实参

cout << "swap1 a = " << a << endl;

cout << "swap1 b = " << b << endl;

swap2(&a, &b); //地址传递会改变实参

cout << "swap2 a = " << a << endl;

cout << "swap2 b = " << b << endl;

system("pause");

return 0;

lambda使用错误：章节”C++11常用新特性(二）“

在 ”C++11常用新特性(二）“ 章节中，说道：
`class Filter
{
public:
Filter(int divisorVal):
divisor{divisorVal}
{}

std::function<bool(int)> getFilter() 
{
    return [=](int value) {return value % divisor == 0; };
}

private:
int divisor;
};`

这个类中有一个成员方法，可以返回一个lambda表达式，这个表达式使用了类的数据成员divisor。而且采用默认值方式捕捉所有变量。你可能认为这个lambda表达式也捕捉了divisor的一份副本，但是实际上并没有。因为数据成员divisor对lambda表达式并不可见，你可以用下面的代码验证：*******.

我验证过了， [=] 能捕获到类数据成员，比如下面没问题：
`#include
#include

using namespace std;

class Demo {
public:
Demo():m_i(100) {}
virtual ~Demo() {}

void func(int x) {
auto f1 = [=]{ std::cout << &m_i << std::endl; return m_i + x; };
std::cout << f1() << std::endl;
std::cout << &m_i << std::endl;
}
std::function<int(int)> getFunc() {
return [=](int val) { return val + m_i; };
}
void setData(int d) {
m_i = d;
}

private:
int m_i;
};

int main() {
Demo d;
d.func(10);
std::function<int(int)> ff;
{
Demo dd;
ff = dd.getFunc();
dd.setData(400);
}
std::cout << "-------" << std::endl;
//
std::cout << ff(200) << std::endl;
return 0;

0voice / cpp_new_features Goto Github PK

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cpp_new_features's Issues

阿里网盘视频没了

7.7 指针和函数输出最好修改一下哟

good

图片打不开了

lambda使用错误：章节”C++11常用新特性(二）“

C++

New

long int

学习

这是错别字吗

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