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generic programming example added for RAII in C

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This commit is contained in:
Richard Thier 2025-04-25 01:50:15 +02:00
parent 1b860723b8
commit 6f106988b4
3 changed files with 47 additions and 1 deletions
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15
array.h Normal file
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@ -0,0 +1,15 @@
#include <stdlib.h>
#include "handle.h"
/* Generic array macro */
#define Array(T,AT) struct AT { \
size_t count; \
T *v; \
}; handle(AT) { \
if(state == HANDLE_CREAT) { \
self->count = *(size_t*) data; \
self->v = (T*) calloc(self->count, sizeof(T)); \
} else if (state == HANDLE_DESTR){ \
if(self->v) free(self->v); \
} \
}

26
array_handle_gen_test.c Normal file
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@ -0,0 +1,26 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "array.h"
/* Prepare usage for 64 bit arrays - adds "Array_uint64" for creat */
Array(uint64_t, Array_uint64);
int main() {
int n;
printf("Number of elements to sum: ");
scanf(" %d", &n);
/* Create a 64 bit array of 'n' elements */
creat(Array_uint64, data, &n);
// printf("vektor.count:%d\n", data.count);
for(int i = 0; i < data.count; ++i) {
scanf(" %d", &n);
data.v[i] = n;
}
n = 0; for(int i = 0; i < data.count; ++i) n += data.v[i];
printf("Sum: %d\n", n);
// RAII releases array here automagicaly!
return 0;
}

7
makefile
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@ -9,7 +9,11 @@ gcc:
g++ raii_test.cpp -o raii_test_cpp
gcc handle_test.c -o handle_test
gcc array_handle_test.c -o array_handle_test
g++ array_handle_test.c -o array_handle_test_gpp
g++ array_handle_test.c -o array_handle_test_cpp
gcc array_test.c -o array_test
g++ array_test.c -o array_test_cpp
gcc array_handle_gen_test.c -o array_handle_gen_test
g++ array_handle_gen_test.c -o array_handle_gen_test_cpp
clang:
clang macroname.c -o macroname
clang count.c -o count
@ -18,5 +22,6 @@ clang:
clang construct_destruct.c -o construct_destruct
# clang raii_test.c -o raii_test # should not work
clang++ raii_test.cpp -o raii_test_cpp
clang++ array_handle_gen_test.c -o array_handle_gen_test_cpp
expand:
gcc -E handle_test.c -o handle_test_expanded.c