[79308c8e] | 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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[58daf53] | 10 | // Created On : Wed May 24 15:40:00 2017 |
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[91c389a] | 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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[79308c8e] | 14 | // |
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| 15 | |
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| 16 | #include <containers/maybe> |
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[91c389a] | 17 | #include <assert.h> |
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[79308c8e] | 18 | |
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| 19 | |
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| 20 | forall(otype T) |
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[aca65621] | 21 | void ?{}(maybe(T) & this) { |
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| 22 | this.has_value = false; |
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[79308c8e] | 23 | } |
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| 24 | |
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| 25 | forall(otype T) |
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[aca65621] | 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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[79308c8e] | 29 | } |
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| 30 | |
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| 31 | forall(otype T) |
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[aca65621] | 32 | void ?{}(maybe(T) & this, maybe(T) other) { |
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| 33 | this.has_value = other.has_value; |
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[79308c8e] | 34 | if (other.has_value) { |
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[aca65621] | 35 | (this.value){other.value}; |
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[58daf53] | 36 | } |
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| 37 | } |
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| 38 | |
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| 39 | forall(otype T) |
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[aca65621] | 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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[58daf53] | 46 | } else if (that.has_value) { |
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[aca65621] | 47 | this.has_value = true; |
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| 48 | (this.value){that.value}; |
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[79308c8e] | 49 | } |
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[aca65621] | 50 | return this; |
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[79308c8e] | 51 | } |
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| 52 | |
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| 53 | forall(otype T) |
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[aca65621] | 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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[79308c8e] | 57 | } |
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| 58 | } |
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| 59 | |
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| 60 | forall(otype T) |
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[64fc0ba] | 61 | bool ?!=?(maybe(T) this, zero_t) { |
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[58daf53] | 62 | return this.has_value; |
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[79308c8e] | 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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[64fc0ba] | 67 | return (maybe(T)){value}; |
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[79308c8e] | 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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[64fc0ba] | 72 | return (maybe(T)){}; |
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[79308c8e] | 73 | } |
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| 74 | |
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| 75 | forall(otype T) |
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[64fc0ba] | 76 | bool has_value(maybe(T) * this) { |
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[79308c8e] | 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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[58daf53] | 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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[aca65621] | 92 | (this->value){value}; |
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[58daf53] | 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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[aca65621] | 100 | ^(this->value){}; |
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[58daf53] | 101 | } |
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| 102 | } |
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