66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
/* file exprstatestack.hpp
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*
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* author: Roland Conybeare, Aug 2024
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*/
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#pragma once
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#include "exprstate.hpp"
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namespace xo {
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namespace scm {
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/** @class exprstatestack
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* @brief A stack of exprstate objects
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**/
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class exprstatestack {
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public:
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exprstatestack() {}
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bool empty() const { return stack_.empty(); }
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std::size_t size() const { return stack_.size(); }
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exprstate & top_exprstate();
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void push_exprstate(std::unique_ptr<exprstate> exs);
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std::unique_ptr<exprstate> pop_exprstate();
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/** relative to top-of-stack.
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* 0 -> top (last in), z-1 -> bottom (first in)
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**/
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std::unique_ptr<exprstate> & operator[](std::size_t i) {
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std::size_t z = stack_.size();
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assert(i < z);
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return stack_[z - i - 1];
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}
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const std::unique_ptr<exprstate> & operator[](std::size_t i) const {
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std::size_t z = stack_.size();
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assert(i < z);
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return stack_[z - i - 1];
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}
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void print (std::ostream & os) const;
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private:
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std::vector<std::unique_ptr<exprstate>> stack_;
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};
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inline std::ostream &
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operator<< (std::ostream & os, const exprstatestack & x) {
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x.print(os);
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return os;
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}
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inline std::ostream &
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operator<< (std::ostream & os, const exprstatestack * x) {
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x->print(os);
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return os;
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}
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} /*namespace scm*/
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} /*namespace xo*/
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/* end exprstatestack.hpp */
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