[英]How to use struct with stack?
Normally when we use stack we do this....通常,当我们使用堆栈时,我们会这样做......
stack<int>st;
st.push(1);
st.push(2);
st.push(3);
cout<<st.top<<"\n"
But my question is how to push and access data when we use struct instead of int/char type variable?但我的问题是当我们使用 struct 而不是 int/char 类型变量时如何推送和访问数据? For example...例如...
struct st
{
int index, value;
};
int main()
{
stack<st>STACK;
/*
code
*/
}
Now, here how can I push element in stack and access them?现在,在这里我如何将元素推入堆栈并访问它们?
You can push to std::stack
by using Aggregate initialization , or adding a constructor to your structure or std::stack::emplace
.您可以通过使用Aggregate Initialization或向您的结构或std::stack::emplace
添加构造函数来推送到std::stack
。
By using constructor:通过使用构造函数:
struct st
{
st(int _index, int _value) : index(_index), value(_value) {}
int index, value;
};
std::stack<st> s;
s.push(st(10, 20));
By using Aggregate initialization:通过使用聚合初始化:
std::stack<int> s;
s.push({10, 20});
To access the element simply call std::stack::top()
.要访问该元素,只需调用std::stack::top()
。
st top = s.top();
or by using C++17 Structured binding declaration :或使用 C++17 结构化绑定声明:
auto [index, value] = s.top();
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