錯誤C2678使用模板

Question

我正在定義一個優先級隊列並將其用於自定義結構，但是我得到這個錯誤，我不知道如何解決它。

這是我的錯誤：

error C2678: binary '<' : no operator found which takes a left-hand operand 
of type 'const Location' (or there is no acceptable conversion) 

我的結構位置

struct Location 
{ 
    int x, y, value; 
    Location(int a, int b); 
    bool operator == (const Location& other); 
    bool operator < (const Location& other); 
}; 

Location:: Location(int a, int b) { 
    x = a; 
    y = b; 
    value = 0; 
} 

bool Location:: operator == (const Location& other) { 
    return (x == other.x && y == other.y); 
} 

bool Location:: operator < (const Location& other) { 
    return value > other.value; 
} 

這裏是我的優先級隊列

template<typename T> 
struct my_priority_queue { 

priority_queue<T, vector<T>, greater<T>> elements; 
bool empty() 
{ 
    return elements.empty(); 
} 
void push(T item) 
{ 
    elements.emplace(item); 
} 
T pop() 
{ 
    T best = elements.top(); 
    elements.pop(); 
    return best; 
} 
}; 

主要功能

int main() { 
    Location a(0, 0); 
    Location b(1, 2); 
    Location c(3, 0); 
    my_priority_queue<Location> my_pq; 
    my_pq.push(a); 
} 

Answer 1

就像它說的那樣。

由於不是const函數，您的運營商不能在LHS上執行const Location。

bool operator == (const Location& other) const; 
bool operator < (const Location& other) const; 
//          ^^^^^^