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| -rw-r--r-- | LICENSE | 22 | ||||
| -rw-r--r-- | README.md | 13 | ||||
| -rw-r--r-- | example.c | 72 |
3 files changed, 107 insertions, 0 deletions
@@ -0,0 +1,22 @@ +MIT License + +Copyright (C) 2023 Yaroslav de la Peña Smirnov + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + diff --git a/README.md b/README.md new file mode 100644 index 0000000..e6fa20e --- /dev/null +++ b/README.md @@ -0,0 +1,13 @@ +# C Optional + +Poor man's optional "type templates" for C. + +In its current form it's intended to be used with "one word" types. Might +or might not "make it compatible" with structs, enums, unions, etc. in the +future, if the need arises. + +Just for fun. + +## Example usage + +If you want to see an example on how to use it, see `example.c`. diff --git a/example.c b/example.c new file mode 100644 index 0000000..fb71718 --- /dev/null +++ b/example.c @@ -0,0 +1,72 @@ +#include <stdio.h> + +#include "optional.h" + +OPTIONALDEC(int); +OPTIONALDEC(float); + +struct mine { + OPTIONAL(int) a; + OPTIONAL(int) b; +}; + +OPTIONAL(int) +ithas(void) +{ + OPTIONAL(int) r = OPTSOME(10); + return r; +} + +OPTIONAL(int) +ithasnt(void) +{ + OPTIONAL(int) r = OPTNONE; + return r; +} + +void +optput(OPTIONAL(float) *dst, float src) +{ + opt_set_some(*dst, 6.9); +} + +int +main(int argc, const char *argv[]) +{ + int a, b; + struct mine mine = { + .a = OPTSOME(69), + .b = OPTNONE, + }; + OPTIONAL(float) y = OPTNONE; + OPTIONAL(float) z = OPTSOME(1.1); + float uy, uz, xy = opt_default(y, 6.9), xz = opt_default(z, 6.9); + float e = y.has ? y.data : 6.9; + float f = opt_default(y, 6.9); + + opt_set_some(mine.b, 10); + opt_set_none(mine.a); + + if (opt_unwrap(mine.a, a)) { + printf("has a = %d\n", a); + } else { + printf("doesn't have a\n"); + } + if (opt_unwrap(mine.b, b)) { + printf("has b = %d\n", b); + } else { + printf("doesn't have b\n"); + } + if (opt_unwrap(y, uy)) { + printf("has y = %f\n", uy); + } else { + printf("doesn't have y\n"); + } + if (opt_unwrap(z, uz)) { + printf("has z = %f\n", uz); + } else { + printf("doesn't have z\n"); + } + + printf("xy = %f, xz = %f\n", xy, xz); +} |