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annotate interpreter.h @ 7:04867eba6428

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function objects and signals/slots for errors and results
author John W. Eaton <jwe@octave.org>
date Thu, 23 May 2019 09:27:09 -0400
parents 1b575145197e
children 894be158b32d
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1 #if ! defined (calc_interpreter_h)
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2 #define calc_interpreter_h 1
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4 #include <functional>
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6 namespace calc
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7 {
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8 class interpreter
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9 {
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10 public:
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12 static interpreter *the_interpreter;
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14 interpreter (void);
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16 interpreter (const interpreter&) = delete;
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18 interpreter& operator = (const interpreter&) = delete;
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20 ~interpreter (void);
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22 int parse_and_execute (const std::string& line);
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23
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24 std::function<void (const char *)>
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25 set_error_handler (const std::function<void (const char *)>& error_handler)
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26 {
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27 std::function<void (const char *)> tmp = m_error_handler;
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28 m_error_handler = error_handler;
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29 return tmp;
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30 }
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32 std::function<void (double)>
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33 set_result_handler (const std::function<void (double)>& result_handler)
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34 {
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35 std::function<void (double)> tmp = m_result_handler;
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36 m_result_handler = result_handler;
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37 return tmp;
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38 }
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40 void emit_error (const char *msg);
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42 void emit_result (double value);
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44 private:
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46 std::function<void (const char *)> m_error_handler;
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47 std::function<void (double)> m_result_handler;
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48 };
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49 }
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51 #endif