C++primer 10.3.4节练习

练习10.22

 1 #include<iostream>
 2 #include<string>
 3 #include <iostream>
 4 #include <string>
 5 #include <vector>
 6 #include <algorithm>
 7 #include <list>
 8 #include <functional>
 9 using namespace std;
10 using namespace placeholders;
11 
12 void elmDups(vector<string> &vec);
13 
14 bool isShorter(string str, string str1);
15 
16 void biggies(vector<string> &words, vector<string>::size_type sz);
17 
18 bool longThan(const string &s, vector<string>::size_type sz);
19 
20 ostream &print(ostream &os, const string &s);
21 
22 int main()
23 {
24     vector<string> words{ "the", "quick", "red", "fox", "jumps", "over","the", "slow","red","turtle" };
25     elmDups(words);
26     stable_sort(words.begin(), words.end(), isShorter);
27     int c = count_if(words.begin(), words.end(), bind(longThan, _1, 5));
28     cout << c << endl;
29     for_each(words.begin(), words.end(), bind(print, ref(cout), _1));
30     system("pause");
31     return 0;
32 }
33 
34 void elmDups(vector<string>& vec)
35 {
36     sort(vec.begin(), vec.end());
37     auto it = unique(vec.begin(), vec.end());
38     vec.erase(it, vec.end());
39 }
40 
41 bool isShorter(string str, string str1)
42 {
43     return str.size() < str1.size() ? true : false;
44 }
45 
46 
47 void biggies(vector<string>& words, vector<string>::size_type sz)
48 {
49     elmDups(words);
50     stable_sort(words.begin(), words.end(), isShorter);
51     auto wc = stable_partition(words.begin(), words.end(), [sz](const string &s) {return s.size() < sz;});
52     auto count = words.end() - wc;
53     cout << count << endl;
54     for_each(wc, words.end(), [](const string &s) { cout << s << " "; });
55     cout << endl;
56 }
57 
58 bool longThan(const string &s, vector<string>::size_type sz)
59 {
60     if (s.size() <= sz)
61         return true;
62     else
63         return false;
64 }
65 
66 ostream & print(ostream & os, const string & s)
67 {
68     os << s << " ";
69     return os;
70     // TODO: 在此处插入 return 语句
71 }

练习10.23

bind接受的参数为绑定的函数参数加一，那个一为绑定的函数名；当使用bind生成一个新的可调用的对象时，该对象的参数取决于bind中有几个占位符；

练习10.24

 1 #include<iostream>
 2 #include<string>
 3 #include <iostream>
 4 #include <string>
 5 #include <vector>
 6 #include <algorithm>
 7 #include <list>
 8 #include <functional>
 9 using namespace std;
10 using namespace placeholders;
11 
12 bool check_size(int i, const string &s2);
13 
14 int main()
15 {
16     //vector<string> words{ "the", "quick", "red", "fox", "jumps", "over","the", "slow","red","turtle" };
17     vector<int> vec{ 1,2,3,4,5,7,8,9,10,11,12, 1 };
18     auto it = find_if(vec.begin(), vec.end(), bind(check_size, _1, "hello"));
19     cout << *it << endl;
20     system("pause");
21     return 0;
22 }
23 
24 bool check_size(int i, const string & s2)
25 {
26     return i > s2.size();
27 }

练习10.25

 1 #include<iostream>
 2 #include<string>
 3 #include <iostream>
 4 #include <string>
 5 #include <vector>
 6 #include <algorithm>
 7 #include <list>
 8 #include <functional>
 9 using namespace std;
10 using namespace placeholders;
11 
12 void elmDups(vector<string> &vec);
13 
14 bool isShorter(string str, string str1);
15 
16 void biggies(vector<string> &words, vector<string>::size_type sz);
17 
18 bool check_size(const string &s1, vector<string>::size_type sz);
19 
20 ostream &print(ostream &os, const string &s);
21 
22 int main()
23 {
24     vector<string> words{ "the", "quick", "red", "fox", "jumps", "over","the", "slow","red","turtle" };
25     biggies(words, 5);
26     system("pause");
27     return 0;
28 }
29 
30 void elmDups(vector<string>& vec)
31 {
32     sort(vec.begin(), vec.end());
33     auto it = unique(vec.begin(), vec.end());
34     vec.erase(it, vec.end());
35 }
36 
37 bool isShorter(string str, string str1)
38 {
39     return str.size() < str1.size() ? true : false;
40 }
41 
42 
43 void biggies(vector<string>& words, vector<string>::size_type sz)
44 {
45     elmDups(words);
46     stable_sort(words.begin(), words.end(), isShorter);
47     auto wc = partition(words.begin(), words.end(), bind(check_size, _1, sz));
48     auto count = words.end() - wc;
49     cout << count << endl;
50     for_each(wc, words.end(), [](const string &s) { cout << s << " "; });
51     cout << endl;
52 }
53 
54 bool check_size(const string & s1, vector<string>::size_type sz)
55 {
56     return s1.size() < sz;
57 }
58 
59 ostream & print(ostream & os, const string & s)
60 {
61     os << s << " ";
62     return os;
63     // TODO: 在此处插入 return 语句
64 }

 

posted @ 2017-08-14 16:43  五月份小姐  阅读(322)  评论(0)    收藏  举报