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diff --git a/devdocs/c/memory%2Ffree_sized.html b/devdocs/c/memory%2Ffree_sized.html new file mode 100644 index 00000000..36a5ad8f --- /dev/null +++ b/devdocs/c/memory%2Ffree_sized.html @@ -0,0 +1,70 @@ + <h1 id="firstHeading" class="firstHeading">free_sized</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code><stdlib.h></code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c23"> <td> <pre data-language="c">void free_sized( void* ptr, size_t size );</pre> +</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c23">(since C23)</span> </td> </tr> </table> <p>Deallocates the space previously allocated by <code><a href="malloc" title="c/memory/malloc">malloc()</a></code>, <code><a href="calloc" title="c/memory/calloc">calloc()</a></code>, or <code><a href="realloc" title="c/memory/realloc">realloc()</a></code> (but not <code>aligned_alloc()</code>).</p> +<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> ptr </td> <td> - </td> <td> pointer to the memory to deallocate </td> +</tr> <tr class="t-par"> <td> size </td> <td> - </td> <td> size of memory previously passed to an allocation function </td> +</tr> +</table> <h3 id="Return_value"> Return value</h3> <p>(none)</p> +<h3 id="Notes"> Notes</h3> <h3 id="Possible_implementation"> Possible implementation</h3> <div class="c source-c"><pre data-language="c">void free_sized(void* ptr, size_t /*size*/) +{ + free(ptr); +}</pre></div> <h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> + +typedef struct +{ + size_t size; // current number of elements + size_t capacity; // reserved number of elements + void** data; +} PtrVector; + +PtrVector vector_create(size_t initial_capacity) +{ + PtrVector ret = + { + .capacity = initial_capacity, + .data = (void**) malloc(initial_capacity * sizeof(void*)) + }; + return ret; +} + +void vector_delete(PtrVector* self) +{ + free_sized(self->data, self->capacity * sizeof(void*)); +} + +void vector_push_back(PtrVector* self, void* value) +{ + if (self->size == self->capacity) + { + self->capacity *= 2; + self->data = (void**) realloc(self->data, self->capacity * sizeof(void*)); + } + self->data[self->size++] = value; +} + +int main() +{ + int data = 42; + float pi = 3.141592f; + PtrVector v = vector_create(8); + vector_push_back(&v, &data); + vector_push_back(&v, &pi); + printf("data[0] = %i\n", *(int*)v.data[0]); + printf("data[1] = %f\n", *(float*)v.data[1]); + vector_delete(&v); +}</pre></div> <p>Output:</p> +<div class="text source-text"><pre data-language="c">data[0] = 42 +data[1] = 3.141592</pre></div> </div> <h3 id="References"> References</h3> <ul> +<li> C23 standard (ISO/IEC 9899:2023): </li> +<ul><li> 7.24.3.4 The free_sized function </li></ul> +</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="free" title="c/memory/free"> <span class="t-lines"><span>free</span></span></a></div> </td> <td> deallocates previously allocated memory <br> <span class="t-mark">(function)</span> </td> +</tr> <tr class="t-dsc"> <td> <div><a href="free_aligned_sized" title="c/memory/free aligned sized"> <span class="t-lines"><span>free_aligned_sized</span></span></a></div> +<div><span class="t-lines"><span><span class="t-mark-rev t-since-c23">(C23)</span></span></span></div> </td> <td> deallocates previously allocated sized and aligned memory <br> <span class="t-mark">(function)</span> </td> +</tr> <tr class="t-dsc"> <td> <div><a href="malloc" title="c/memory/malloc"> <span class="t-lines"><span>malloc</span></span></a></div> </td> <td> allocates memory <br> <span class="t-mark">(function)</span> </td> +</tr> </table> <div class="_attribution"> + <p class="_attribution-p"> + © cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br> + <a href="https://en.cppreference.com/w/c/memory/free_sized" class="_attribution-link">https://en.cppreference.com/w/c/memory/free_sized</a> + </p> +</div> |