我在Windows 7 64位上使用msvs6.0和sp6。Win32控制台应用程序。仍然在VS 6.0上,因为我必须维护遗留代码。大多数vs6的东西工作没有问题。
我试图通过查看bind2nd来了解:https://msdn.microsoft.com/en-us/library/3f0defz2.aspx
代码在编译时失败,给出错误(其中包括):'iterator':使用类模板需要模板参数列表代码在
注释后的那行失败我如何纠正这段代码,使其编译?
代码
#include <vector>
#include <functional>
#include <algorithm>
#include <iostream>
using namespace std;
// Creation of a user-defined function object that inherits from
// the unary_function base class
class greaterthan15: unary_function<int, bool>
{
public:
result_type operator()( argument_type i )
{
return ( result_type )( i > 15 );
}
};
int main()
{
vector<int> v1;
vector<int>::iterator Iter;
int i;
for ( i = 0; i <= 5; i++ )
{
v1.push_back( 5 * i );
}
cout << "The vector v1 = ( ";
for ( Iter = v1.begin(); Iter != v1.end(); Iter++ )
cout << *Iter << " ";
cout << ")" << endl;
// Count the number of integers > 10 in the vector
// COMPILE FAILS ON NEXT LINE
vector<int>::iterator::difference_type result1a;
result1a = count_if( v1.begin(), v1.end(), bind2nd( greater<int>(), 10 ) );
cout << "The number of elements in v1 greater than 10 is: "
<< result1a << "." << endl;
// Compare counting the number of integers > 15 in the vector with
// a user-defined function object
vector<int>::iterator::difference_type result1b;
result1b = count_if( v1.begin(), v1.end(), greaterthan15() );
cout << "The number of elements in v1 greater than 15 is: "
<< result1b << "." << endl;
// Count the number of integers < 10 in the vector
vector<int>::iterator::difference_type result2;
result2 = count_if( v1.begin(), v1.end(), bind1st(greater<int>(), 10 ) );
cout << "The number of elements in v1 less than 10 is: "
<< result2 << "." << endl;
}
我很幸运,不用再使用MSVC6了,所以我不能检查我的建议,无论如何,试着转
vector<int>::iterator::difference_type
到
vector<int>::difference_type