我在正确获取语法时遇到问题，所以如果有人可以提供帮助，好吗？我有一个计时函数，它接受一个函数及其参数作为参数，但我不确定调用应该是什么样子。
#include <iostream>
#include <iterator>
#include <random>
#include <vector>
#include<list>
#include<deque>
#include <algorithm>
#include <chrono>
#include <functional>
#include <sstream>
using namespace std;
using namespace std::chrono;
int global_SortType = 1;
template<class F, class A, typename T>
void times(F func, A arg, int n, T typeval) // call func(arg,n)
{
auto t1 = system_clock::now();
func(arg, n, typeval);
auto t2 = system_clock::now();
auto dms = duration_cast<milliseconds>(t2-t1);
cout << "f(x) took " << dms.count() << " milliseconds\n";
}
template<class T>
bool Greater(const T& v1, const T& v2)
{
return false;
}
bool Greater(const int& v1, const int& v2)
{
return v1 > v2;
}
bool Greater(const string& v1, const string& v2)
{
return strcmp(v1.c_str(), v2.c_str()) > 0;
}
template <class T>
struct GreaterThan: public std::binary_function<T, T, bool > {
bool operator () ( const T &ival, const T &newval ) const {
return Greater(ival, newval);
}
};
string random_gen(string& s)
{
string Result; // string which will contain the result
ostringstream convert; // stream used for the conversion
convert << rand();
return convert.str();
}
int random_gen(int& i){
default_random_engine re { std::random_device()() };
uniform_int_distribution<int> dist;
auto r= bind(dist,re);
int x =r();
return x;
}
template<class T>
void print(T& val)
{
}
void print(int& val)
{
cout << val << " ";
}
void print(string& val)
{
cout << val.c_str() << " ";
}
struct Record
{
int v;
string s;
Record(){}
Record(int iv, string ss): v(iv), s(ss)
{
}
};
Record random_gen(Record& r)
{
string stemp;
int i = 0;
return Record(random_gen(i), random_gen(stemp));
}
void print(Record& r)
{
cout<<"int="<<r.v<<" string=";
print(r.s);
}
bool Greater(const Record& r1, const Record& r2)
{
return global_SortType == 1 ? Greater(r1.v, r2.v) : Greater(r1.s, r2.s);
}
template<typename SequenceContainer, class T>
void build_cont(SequenceContainer& seq, int n, T valtype)
{
for(int i=0; i!=n; ++i) {
T gen = random_gen(valtype);
typename SequenceContainer::const_iterator it;
it=find_if(seq.begin(), seq.end(), std::bind2nd(GreaterThan<T>(), gen));
seq.insert(it, gen);
}
for(int i=n-1; i >=0; i--)
{
int gen = i;
if(i > 0)
gen = random_gen(i)%i;
typename SequenceContainer::const_iterator it=seq.begin();
for(int j = 0; j < gen; j++)
it++;
seq.erase(it);
}
}
int main()
{
int n=1000;
vector<int> v;
times(build_cont<std::vector<int>, int>, v, n, 0); // works
vector<string> sv;
string stemp = "";
times(build_cont<std::vector<string>, string>, sv, n, stemp); // works
global_SortType = 1;
vector<Record> rv;
Record rtemp(0, "sfds");
global_SortType = 2;
vector<Record> rsv;
Record rstemp(0, "sfds");
//This one desn't work and I'm not sure of the right syntax
times(build_cont<std::vector<Record>,Record>, sv, n, stemp);
return 0;
}
我收到此错误 对“vector>”类型的非 const 左值引用无法绑定到不相关类型“vector, allocator>>”的值
它指向线
func(arg, n, typeval);