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#ifndef INCLUDED_STACK_
#define INCLUDED_STACK_
#include <cstdint>
#include <vector>
#include <string>
class Variable; // the abstract base class for Ints, Strings,
// and Lists.
// conceptually the stack grows from high to low, but the vector
// grows from low to high. For pushing and popping that's irrelevant,
// but when accessing a stack element based on its index the
// sign of the index is negated.
class Stack
{
std::string d_bimFilename;
std::vector<Variable> d_stack;
unsigned d_BP = 0;
public:
Stack(unsigned idx, unsigned argc, char **argv);
Variable &operator[](int index);
void push(Variable &&tmp); // 1
void push(Variable const &var); // 2
Variable topMove() noexcept;
Variable &top(); // .f
void pop(); // .f
void pushBP();
void popBP();
void asp(uint16_t nElements); // .f
private:
void pushCharPtrPtr(char **src);
void pushArgs(unsigned idx, unsigned argc, char **argv);
};
#include "asp.f"
#include "pop.f"
#include "top.f"
#endif
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