关于Boost::multi_index_container，错误c3849，绑定到int有什么问题

Again about Boost::multi_index_container, error c3849, what is wrong with binding to an int?

本文关键字：int 什么 问题 绑定 c3849 index Boost container 关于 错误 multi      更新时间：2023-10-16

我有下面的代码，但"int age"似乎有问题，代码如下：

struct MyStruct
{
    char* firstName;
    char* secondName;
    int age;
};
typedef composite_key
    <MyStruct*,
    BOOST_MULTI_INDEX_MEMBER(MyStruct, char*, firstName),
    BOOST_MULTI_INDEX_MEMBER(MyStruct, char*, secondName),
    BOOST_MULTI_INDEX_MEMBER(MyStruct, int, age)
    > comp_key;

struct CompareLess
{   // functor for operator<=
    static inline int compare(const char* left, const char* right)
    {
        return strcmp(left, right);
    }
    inline bool operator()(const char* left, const char* right) const
    {   // apply operator<= to operands
        return compare(left, right)<0;
    }
    static inline int compare(const MyStruct* myStruct1, const MyStruct* myStruct2)
    {
        int result= compare(myStruct1->firstName, myStruct2->firstName);
        if(result!=0)
            return result;
        else
        {
            return compare(myStruct2->secondName, myStruct2->secondName);
        }
    }
    inline bool operator()(const MyStruct* myStruct1, const MyStruct* myStruct2)
    {
        return compare(myStruct1, myStruct2)<0;
    }
};
typedef multi_index_container
    <
    MyStruct*, 
    indexed_by
        <
        ordered_unique
            <
                comp_key,
                /*CompareLess*/
                composite_key_compare
                <
                    CompareLess,
                    CompareLess,
                    std::less<int>
                >
            >
        >
    > MyContainer;

boost::ptr_vector<MyStruct> vec;
MyStruct* struct1=new MyStruct();
struct1->firstName="Michael";
struct1->secondName="Mike";
struct1->age=20;
vec.push_back(struct1);

MyContainer myContainer;
myContainer.insert(struct1);
char* first="Michael";
char* second="Mike";
string michael="Michael";
auto it=myContainer.find(boost::make_tuple(michael.c_str(), (const char*)second,20);
if(it!=myContainer.end())
    cout << (*it)->age << endl;

问题出在"（boost:：make_tuple（michael.c_str（），（constchar*）second），20）"上，它似乎无法接受"20"。详细错误如下：

C： \boost_1_52\boost/multi_index/composite_key.hpp（381）：错误C3849：对类型为"int"的表达式的函数样式调用将丢失所有3个可用运算符重载的const和/或volatile限定符1> C:\boost_1_52\boost/multi_index/composite_key.hpp（380

有办法解决这个问题吗？

在修复了一个微不足道的语法错误（缺少括号）并添加了#include等之后，事情就在这里工作了（MSVC 2012.）

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