diff options
Diffstat (limited to 'docs/manual/dom.html')
| -rw-r--r-- | docs/manual/dom.html | 48 |
1 files changed, 23 insertions, 25 deletions
diff --git a/docs/manual/dom.html b/docs/manual/dom.html index 2d65070..def86a5 100644 --- a/docs/manual/dom.html +++ b/docs/manual/dom.html @@ -371,9 +371,10 @@ </p></td></tr> </table></div> <p> - All tree functions that work with strings work with either C-style null terminated - strings or STL strings of the selected character type. For example, node - name accessors look like this in char mode: + $$ wording - one may think that child() has a string overload All tree functions + that work with strings work with either C-style null terminated strings or + STL strings of the selected character type. For example, node name accessors + look like this in char mode: </p> <pre class="programlisting"><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">name</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span> <span class="keyword">bool</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">set_name</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">value</span><span class="special">);</span> @@ -416,7 +417,12 @@ performs conversion from UTF-8 to UTF-16/32. Invalid UTF sequences are silently discarded upon conversion. <code class="computeroutput"><span class="identifier">str</span></code> has to be a valid string; passing null pointer results in undefined behavior. + There are also two overloads with the same semantics which accept a string + as an argument: </p> +<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">as_utf8</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span><span class="special">&</span> <span class="identifier">str</span><span class="special">);</span> +<span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span> <span class="identifier">as_wide</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">str</span><span class="special">);</span> +</pre> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td> @@ -493,7 +499,7 @@ guarantees beyond the ones provided by callback. </p> <p> - XPath functions may throw <code class="computeroutput"><span class="identifier">xpath_exception</span></code> + $$ XPath functions may throw <code class="computeroutput"><span class="identifier">xpath_exception</span></code> on parsing error; also, XPath implementation uses STL, and thus may throw i.e. <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">bad_alloc</span></code> in low memory conditions. Still, XPath functions provide strong exception guarantee. @@ -514,10 +520,10 @@ functions</a> </h4></div></div></div> <a name="allocation_function"></a><a name="deallocation_function"></a><p> - All memory for tree structure/data is allocated via globally specified - functions, which default to malloc/free. You can set your own allocation - functions with set_memory_management functions. The function interfaces - are the same as that of malloc/free: + All memory for tree structure, tree data and XPath objects is allocated + via globally specified functions, which default to malloc/free. You can + set your own allocation functions with set_memory_management functions. + The function interfaces are the same as that of malloc/free: </p> <pre class="programlisting"><span class="keyword">typedef</span> <span class="keyword">void</span><span class="special">*</span> <span class="special">(*</span><span class="identifier">allocation_function</span><span class="special">)(</span><span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">);</span> <span class="keyword">typedef</span> <span class="keyword">void</span> <span class="special">(*</span><span class="identifier">deallocation_function</span><span class="special">)(</span><span class="keyword">void</span><span class="special">*</span> <span class="identifier">ptr</span><span class="special">);</span> @@ -533,13 +539,15 @@ <p> Allocation function is called with the size (in bytes) as an argument and should return a pointer to memory block with alignment that is suitable - for pointer storage and size that is greater or equal to the requested - one. If the allocation fails, the function has to return null pointer (throwing - an exception from allocation function results in undefined behavior). Deallocation - function is called with the pointer that was returned by the previous call - or with a null pointer; null pointer deallocation should be handled as - a no-op. If memory management functions are not thread-safe, library thread - safety is not guaranteed. + for storage of primitive types (usually a maximum of pointer and <code class="computeroutput"><span class="keyword">double</span></code> types alignment is sufficient) and + size that is greater or equal to the requested one. If the allocation fails, + the function has to return null pointer (throwing an exception from allocation + function results in undefined behavior). + </p> +<p> + Deallocation function is called with the pointer that was returned by the + previous call; it is never called with a null pointer. If memory management + functions are not thread-safe, library thread safety is not guaranteed. </p> <p> This is a simple example of custom memory management (<a href="../samples/custom_memory_management.cpp" target="_top">samples/custom_memory_management.cpp</a>): @@ -572,16 +580,6 @@ are destroyed, the new deallocation function will be called with the memory obtained by the old allocation function, resulting in undefined behavior. </p> -<div class="note"><table border="0" summary="Note"> -<tr> -<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td> -<th align="left">Note</th> -</tr> -<tr><td align="left" valign="top"><p> - Currently memory for XPath objects is allocated using default operators - new/delete; this will change in the next version. - </p></td></tr> -</table></div> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> |