comparison: docs/Writerside/topics/compare.h.md
docs/Writerside/topics/compare.h.md
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| 1 # Compare Functions | |
| 2 | |
| 3 The `compare.h` header file contains a collection of compare functions for various primitive types. | |
| 4 | |
| 5 They come in two flavors: | |
| 6 - prefixed with `cx_vcmp` they are taking the values directly as arguments | |
| 7 - prefixed with `cx_cmp` the signature is designed to be compatible with the `cx_compare_func` function pointer type. | |
| 8 | |
| 9 ## Examples | |
| 10 | |
| 11 In the following example we use `cx_cmp_int32` as compare function for a `CxList` of `int32_t` values. | |
| 12 | |
| 13 ```C | |
| 14 CxList *list = cxArrayListCreate( | |
| 15 cxDefaultAllocator, // use the default stdlib allocator | |
| 16 cx_cmp_int32, // the compare function for the elements | |
| 17 sizeof(int32_t), // the size of one element | |
| 18 256 // reseve space for 256 elements | |
| 19 ); | |
| 20 ``` | |
| 21 | |
| 22 In the next example we simply want to compare two `double` values with rounding tolerance. | |
| 23 Note how the use of the `cx_vcmp` flavour makes it unnecessary to store the literal in a variable just to be able to take an address. | |
| 24 ```C | |
| 25 double x = ... | |
| 26 | |
| 27 if (0 == cx_vcmp(x, 47.11)) { | |
| 28 // do something when equal (except tolerance) | |
| 29 } | |
| 30 ``` | |
| 31 | |
| 32 ## List of Functions | |
| 33 | |
| 34 ```C | |
| 35 #include <cx/compare.h> | |
| 36 | |
| 37 // Value Flavour | |
| 38 cx_vcmp_double | |
| 39 cx_vcmp_float | |
| 40 cx_vcmp_int | |
| 41 cx_vcmp_int16 | |
| 42 cx_vcmp_int32 | |
| 43 cx_vcmp_int64 | |
| 44 cx_vcmp_intptr | |
| 45 cx_vcmp_longint | |
| 46 cx_vcmp_longlong | |
| 47 cx_vcmp_uint | |
| 48 cx_vcmp_uint16 | |
| 49 cx_vcmp_uint32 | |
| 50 cx_vcmp_uint64 | |
| 51 cx_vcmp_uintptr | |
| 52 cx_vcmp_ulongint | |
| 53 cx_vcmp_ulonglong | |
| 54 | |
| 55 // Pointer Flavour | |
| 56 cx_cmp_double | |
| 57 cx_cmp_float | |
| 58 cx_cmp_int | |
| 59 cx_cmp_int16 | |
| 60 cx_cmp_int32 | |
| 61 cx_cmp_int64 | |
| 62 cx_cmp_intptr | |
| 63 cx_cmp_longint | |
| 64 cx_cmp_longlong | |
| 65 cx_cmp_ptr | |
| 66 cx_cmp_uint | |
| 67 cx_cmp_uint16 | |
| 68 cx_cmp_uint32 | |
| 69 cx_cmp_uint64 | |
| 70 cx_cmp_uintptr | |
| 71 cx_cmp_ulongint | |
| 72 cx_cmp_ulonglong | |
| 73 ``` | |
| 74 | |
| 75 <seealso> | |
| 76 <category ref="apidoc"> | |
| 77 <a href="https://ucx.sourceforge.io/api/compare_8h.html">compare.h</a> | |
| 78 </category> | |
| 79 </seealso> |
