C++ error C2893

---已回答 --> 使运算符函数常量！

我正在编写模板并不断收到以下错误：

1 错误 C2893：无法专用化函数模板"未知类型 std：：less：：运算符 （）（_Ty1 &&，_Ty2 &&） const"

尝试将模板与类一起使用时，即使该类具有重载运算符。请注意，该模板确实适用于基元

    ____TEMPLATE_________
        #include <vector>
        #include <algorithm>
        using namespace std;

    template <class T>
    class Set{
        int elements;
        vector <T> MySet;
    public:
    //error is due to this function
    bool find(const T& value) const
        {
            return binary_search(MySet.begin(), MySet.end(), value);    
        }
_____CLASS_________

class CCustomer{
public:
    int CustomerId;
    string Name;
    string Surname;
    int Phone;
    CCustomer(int ID, string Name, string Surname, int Phone)
{
    this->CustomerId = ID;
    this->Name = Name;
    this->Surname = Surname;
    this->Phone = Phone;
}
    bool operator==(const CCustomer &RHS)
{
    if (this->CustomerId == RHS.CustomerId)
    {
        return true;
    }
    return false;
}
    bool operator<(const CCustomer &RHS)
{
    if (this->CustomerId < RHS.CustomerId)
    {
        return true;
    }
    return false;
}
    bool operator>(const CCustomer &RHS)
{
    if (this->CustomerId > RHS.CustomerId)
    {
        return true;
    }
    return false;
}
};
_____MAIN_______
void main()
{
    CCustomer TEST (1234, "abc", "def", 456);
    Set <CCustomer> Myset;
    Myset.find(Test);
}