std :: inserter不工作

Question

我正在编写一个代码，其中一个文件使用set_intersection函数，并且该函数的最后一个参数应该是插入器。但是，当我编译代码，我看到以下错误：

error C2039: 'inserter' : is not a member of 'std' 
error C2873: 'inserter' : symbol cannot be used in a using-declaration 
error C3861: 'inserter': identifier not found 

下面是该文件在使用set_intersection功能

#include "Query.h" 
#include "TextQuery.h" 
#include <set> 
#include <algorithm> 
#include <iostream> 

using std::set; 
using std::ostream; 
using std::inserter; 
using std::set_intersection; 

// returns intersection of its operands' result sets 
set<TextQuery::line_no> 
AndQuery::eval(const TextQuery& file) const 
{ 
    // virtual calls through the Query handle to get result sets for the operands 
    set<line_no> left = lhs.eval(file), 
       right = rhs.eval(file); 

    set<line_no> ret_lines; // destination to hold results 

    // writes intersection of two ranges to a destination iterator 
    // destination iterator in this call adds elements to ret 
    set_intersection(left.begin(), left.end(), 
        right.begin(), right.end(), 
        inserter(ret_lines, ret_lines.begin())); 
    return ret_lines; 
} 

Answer 1

您需要包括<iterator>头的代码。

Answer 2

你忘了#include <iterator>。