1 // chapter18.h
2
3 #ifndef LEARN_CPP_CHAPTER18_H
4 #define LEARN_CPP_CHAPTER18_H
5
6 #include
7 #include
8
9 template
10 T average_list(std::initializer_list arr) {
11 T sum = 0;
12 int num = 0;
13 for (auto x = arr.begin(); x != arr.end(); ++ x, ++ num)
14 sum += *x;
15 return sum / num;
16 }
17 void ch18_1();
18 void ch18_2();
19 void ch18_3();
20 void ch18_4();
21
22
23 #endif //LEARN_CPP_CHAPTER18_H
24
25
26 // chapter18.cpp
27
28 #include "chapter18.h"
29
30 void ch18_1() {
31 using namespace std;
32 // list of double deduced from list contents
33 auto q = average_list({15.4, 10.7, 9.0});
34 cout << q << endl;
35 // list of int deduced from list contents
36 cout << average_list({20, 30, 19, 17, 45, 38}) << endl;
37 // forced list of double
38 auto ad = average_list<double>({'A', 70, 65.33});
39 cout << ad << endl;
40 }
41
42 void ch18_2() {
43
44 }
45
46 void ch18_3() {
47
48 }
49
50 void ch18_4() {
51
52 }
53
54 // 有空再写吧0o0
文章题目：【C++ Primer Plus】编程练习答案——第18章
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