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annotate tests/agcl/ffcalc/number.h @ 6:607e3be6bad8

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Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.
author David A. Holland
date Mon, 30 May 2022 23:46:22 -0400
parents 13d2b8934445
children
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1 #ifndef NUMBER_H
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2 #define NUMBER_H
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3
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4 #include <stdio.h>
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5 #include <assert.h>
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6
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7 class Number {
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8 double value;
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9 int valid;
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10 int *useCount;
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11 int serialNumber;
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12 static int nCreated;
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13 static char buf[];
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14 void logCreation() {*useCount = 1; printf("Create: %d\n", serialNumber); fflush(stdout);
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15 }
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16 public:
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17 Number() : valid(0), useCount(new int), serialNumber(nCreated++) {logCreation();}
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18 Number(double d) : value(d), valid(1), useCount(new int), serialNumber(nCreated++) {logCreation();}
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19 Number(const Number &n)
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20 : value(n.value),
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21 valid(n.valid),
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22 useCount(n.useCount),
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23 serialNumber(n.serialNumber)
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24 {
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25 (*useCount)++;
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26 printf("Copy constructor: %s\n", n.asString());
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27 printf("Copy constructor: %s\n", asString());
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28 fflush(stdout);
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29 }
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30 ~Number() {
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31 assert(*useCount > 0);
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32 if (--(*useCount) == 0) printf("Delete %d\n", serialNumber);
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33 else printf("Destructor: %s\n", asString());
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34 fflush(stdout);
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35 }
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36 char *asString() const {
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37 char *vs = valid ? "valid" : "invalid";
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38 sprintf(buf, "%X: sn%d(%s) = %G, *%X = %d", this, serialNumber, vs, value, useCount, *useCount);
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39 return buf;
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40 }
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41 Number &operator = (const Number &n) {
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42 assert(*useCount > 0);
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43 if (--(*useCount) == 0) printf("Delete %d\n", serialNumber);
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44 fflush(stdout);
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45 useCount = n.useCount;
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46 value = n.value;
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47 valid = n.valid;
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48 serialNumber = n.serialNumber;
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49 (*useCount)++;
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50 return *this;
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51 }
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52 Number &operator += (const Number &n) {valid |= n.valid; value += n.value; return *this;}
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53 Number &operator -= (const Number &n) {valid |= n.valid; value -= n.value; return *this;}
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54 Number &operator *= (const Number &n) {valid |= n.valid; value *= n.value; return *this;}
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55 Number &operator /= (const Number &n) {valid |= n.valid; if(valid) value /= n.value; return *this;}
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56 Number &operator -() {value = -value; return *this;}
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57 operator char * () {
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58 if (valid) {
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59 sprintf(buf, "%G", value);
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60 printf("operator char * = %g\n", value);
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61 return buf;
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62 }
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63 else return "Invalid";
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64 }
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65 };
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66
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67 #endif