我正在尝试编写一个计算密集型程序。我需要 char* 作为 multi_index_container 的composite_key_compare 的比较字段。但是,它似乎不起作用。代码如下:
struct MyStruct
{
char* firstName;
char* secondName;
int age;
};
struct equal_char
{ // functor for operator<=
inline bool operator()(const char* left, const char* right) const
{ // apply operator<= to operands
bool result=(strcmp(left,right)==0);
return result;
}
};
typedef composite_key
<MyStruct*,
BOOST_MULTI_INDEX_MEMBER(MyStruct, char*, firstName),
BOOST_MULTI_INDEX_MEMBER(MyStruct, char*, secondName)
> comp_key;
typedef multi_index_container
<
MyStruct*,
indexed_by
<
ordered_unique
<
comp_key,
composite_key_compare
<equal_char, equal_char>
>
>
> 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";
auto it=myContainer.find(boost::make_tuple(first, second));
if(it!=myContainer.end())
cout << (*it)->age << endl;
我确实追踪了equal_char,发现它确实在“Michael”与“Michael”的第一次比较时返回true,但我还发现equal_char没有被称为“Mike”与“Mike”的第二次比较。谁能帮我解决这个问题?我应该如何编写composite_key_compare?