#include "iostream"
#include "iterator"
#include "vector"
#include "map"
using namespace std;
template <typename T, class T2>
bool compare(T &v1, T2 &v2)
{
return v1 > v2;
}
//费类型参数模板
template <unsigned N, unsigned M>
void comp(char (&a)[N], char (&b)[M])
{
std::cout << end(a) - begin(a) << std::endl;
std::cout << end(b) - begin(b) << std::endl;
a[0] = 92;
}
template <typename T>
class B
{
public:
typedef T t;
//嵌套从属名称std::vector::iterator的形式必须用typename指明
typedef typename std::vector<T>::size_type type_v;
private:
//嵌套从属名称T::iterator的形式必须用typename指明
typename std::vector<T>::size_type len = 0;
std::map<int, std::vector<T>> mMap;
};
template <typename T>
class Father
{
public:
template <typename S>
Father(S s1, S s2);
};
int main()
{
double a = 837.7;
int b = 32;
std::cout << compare(a, b) << std::endl;
std::cout << compare(b, a) << std::endl;
char aa[5];
char bb[89];
comp(aa, bb);
std::vector<int> v1 = {1,2,3,4};
std::vector<int> v2{v1};
v2[2] = 829;
std::cout << "v1 " << v1[2] << " v2 = " << v2[2] << std::endl;
std::initializer_list<int> l1 = {7,8,9};
std::initializer_list<int> l2(l1);
for (auto a : l2){
std::cout << "a = " << a << std::endl;
}
for (int i = 0; i < l2.size(); i++){
std::cout << "i = " << i <<" v = "<< *(l2.begin() + i) << std::endl;
}
return 0;
}
结果:
$ ./a.exe
1
0
5
89
v1 3 v2 = 829
a = 7
a = 8
a = 9
i = 0 v = 7
i = 1 v = 8
i = 2 v = 9