ContextExpectations.h

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#pragma once
 
#include <stack>
 
struct ContextExpectations {
    bool can_take_primitive = true;
    bool can_take_object = false;
};
 
class ExpectationsStack {
    private:
        std::stack<ContextExpectations> stack;
        static constexpr ContextExpectations default_expectations = {true, false};
    public:
        void push(const ContextExpectations& expectations) {
            stack.push(expectations);
        }
 
        void push(bool can_take_primitive, bool can_take_object) {
            stack.push({can_take_primitive, can_take_object});
        }
 
        void pop() {
            if (!stack.empty()) stack.pop();
        }
 
        ContextExpectations top() const {
            if (stack.empty()) return default_expectations;
            return stack.top();
        }
 
        bool canTakePrimitive() const {
            if (stack.empty()) return default_expectations.can_take_primitive;
            return stack.top().can_take_primitive;
        }
 
        bool canTakeObject() const {
            if (stack.empty()) return default_expectations.can_take_object;
            return stack.top().can_take_object;
        }
};