1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // maybe.c -- May contain a value. |
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8 | // |
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9 | // Author : Andrew Beach |
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10 | // Created On : Wed May 24 15:40:00 2017 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Thu Jul 20 15:23:50 2017 |
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13 | // Update Count : 2 |
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14 | // |
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15 | |
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16 | #include <containers/maybe> |
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17 | #include <assert.h> |
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18 | |
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19 | |
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20 | forall(otype T) |
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21 | void ?{}(maybe(T) & this) { |
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22 | this.has_value = false; |
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23 | } |
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24 | |
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25 | forall(otype T) |
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26 | void ?{}(maybe(T) & this, T value) { |
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27 | this.has_value = true; |
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28 | (this.value){value}; |
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29 | } |
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30 | |
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31 | forall(otype T) |
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32 | void ?{}(maybe(T) & this, maybe(T) other) { |
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33 | this.has_value = other.has_value; |
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34 | if (other.has_value) { |
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35 | (this.value){other.value}; |
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36 | } |
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37 | } |
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38 | |
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39 | forall(otype T) |
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40 | maybe(T) ?=?(maybe(T) & this, maybe(T) that) { |
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41 | if (this.has_value & that.has_value) { |
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42 | this.value = that.value; |
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43 | } else if (this.has_value) { |
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44 | ^(this.value){}; |
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45 | this.has_value = false; |
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46 | } else if (that.has_value) { |
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47 | this.has_value = true; |
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48 | (this.value){that.value}; |
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49 | } |
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50 | return this; |
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51 | } |
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52 | |
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53 | forall(otype T) |
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54 | void ^?{}(maybe(T) & this) { |
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55 | if (this.has_value) { |
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56 | ^(this.value){}; |
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57 | } |
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58 | } |
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59 | |
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60 | forall(otype T) |
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61 | bool ?!=?(maybe(T) this, zero_t) { |
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62 | return this.has_value; |
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63 | } |
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64 | |
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65 | forall(otype T) |
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66 | maybe(T) maybe_value(T value) { |
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67 | return (maybe(T)){value}; |
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68 | } |
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69 | |
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70 | forall(otype T) |
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71 | maybe(T) maybe_none() { |
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72 | return (maybe(T)){}; |
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73 | } |
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74 | |
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75 | forall(otype T) |
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76 | bool has_value(maybe(T) * this) { |
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77 | return this->has_value; |
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78 | } |
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79 | |
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80 | forall(otype T) |
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81 | T get(maybe(T) * this) { |
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82 | assertf(this->has_value, "attempt to get from maybe without value"); |
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83 | return this->value; |
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84 | } |
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85 | |
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86 | forall(otype T) |
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87 | void set(maybe(T) * this, T value) { |
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88 | if (this->has_value) { |
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89 | this->value = value; |
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90 | } else { |
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91 | this->has_value = true; |
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92 | (this->value){value}; |
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93 | } |
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94 | } |
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95 | |
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96 | forall(otype T) |
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97 | void set_none(maybe(T) * this) { |
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98 | if (this->has_value) { |
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99 | this->has_value = false; |
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100 | ^(this->value){}; |
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101 | } |
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102 | } |
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