C++实例详解lambda表达式的使用

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
	vector<int> vec;
	for (int i = 0; i < 20; i++)
	{
		vec.push_back(rand() % 100 + 1);
	}
	sort(vec.begin(), vec.end(), [](int a, int b)->bool
		{
			return a > b;
		});
	for (int val : vec)
	{
		cout << val << " ";
	}
	cout << endl;
	//65按序插入序列  要找第一个小于65的数字
	auto it = find_if(vec.begin(), vec.end(),
		[](int a)->bool {return a < 65; });
	if (it != vec.end())
	{
		vec.insert(it, 65);
	}
	for (int val : vec)
	{
		cout << val << " ";
	}
	cout << endl;
	for_each(vec.begin(), vec.end(), [](int a)
		{
			if (a % 2 == 0)
				cout << a << " ";
		});
	cout << endl;
	return 0;
}

#include <iostream>
#include <functional>
#include <queue>
using namespace std;
class Data
{
public:
    Data(int val1 = 10, int val2 = 10) :ma(val1), mb(val2) {}
    int ma;
    int mb;
};
int main()
{
    //优先级队列
    //priority_queue<Data> queue;
    using FUNC = function<bool(Data&, Data&)>;
    priority_queue<Data, vector<Data>, FUNC>
        maxHeap([](Data& d1, Data& d2)->bool
            {
                return d1.mb > d2.mb;
            });
    maxHeap.push(Data(10, 20));
    maxHeap.push(Data(15, 15));
    maxHeap.push(Data(20, 10));
    return 0;
}