Databases
StackOverflow2013
Postsdbo
POvalgrind & C++ : building std::string from character buffers
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POvalgrind & C++ : building std::string from character buffers
    primarykey
    data
    text
    <p>Simple C++ / valgrind question I'm hoping somebody can help out with.</p> <p>When running valgrind against the following code, I get two possible leaks related to std::string : </p> <pre><code>==10325== 17 bytes in 1 blocks are possibly lost in loss record 1 of 2 ==10325== at 0x402569A: operator new(unsigned int) (vg_replace_malloc.c:255) ==10325== by 0x40CFD05: std::string::_Rep::_S_create(unsigned int, unsigned int, std::allocator&lt;char&gt; const&amp;) (in /usr/lib/libstdc++.so.6.0.13) ==10325== by 0x40D0B10: ??? (in /usr/lib/libstdc++.so.6.0.13) ==10325== by 0x40D0CF5: std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;::basic_string(char const*, std::allocator&lt;char&gt; const&amp;) (in /usr/lib/libstdc++.so.6.0.13) ==10325== by 0x804872B: main (test.cc:9) ==10325== ==10325== 17 bytes in 1 blocks are possibly lost in loss record 2 of 2 ==10325== at 0x402569A: operator new(unsigned int) (vg_replace_malloc.c:255) ==10325== by 0x40CFD05: std::string::_Rep::_S_create(unsigned int, unsigned int, std::allocator&lt;char&gt; const&amp;) (in /usr/lib/libstdc++.so.6.0.13) ==10325== by 0x40D0977: std::string::_Rep::_M_clone(std::allocator&lt;char&gt; const&amp;, unsigned int) (in /usr/lib/libstdc++.so.6.0.13) ==10325== by 0x40D17AC: std::string::reserve(unsigned int) (in /usr/lib/libstdc++.so.6.0.13) ==10325== by 0x40D1C7F: std::string::append(std::string const&amp;) (in /usr/lib/libstdc++.so.6.0.13) ==10325== by 0x40D1D63: std::string::operator+=(std::string const&amp;) (in /usr/lib/libstdc++.so.6.0.13) ==10325== by 0x804879D: main (test.cc:11) </code></pre> <p>While it wouldn't be too much work to suppress them, and the code seems straightforward enough to me, I'd like to be sure I'm not missing something obvious here before I try to convince valgrind that I know what I'm doing.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string&gt; int main(int argc, char *argv[]) { char buffer[8192]; sprintf(buffer, "ABCD"); std::string str(buffer); std::string str2 = ""; str2 += str; exit(EXIT_SUCCESS); } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USLightness Races in Orbit
    1. UScubic1271
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POvalgrind & C++ : building std::string from character buffers
      1. USKos
      1. VTFavorite
    2. VO
      singulars
      1. POvalgrind & C++ : building std::string from character buffers
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POvalgrind & C++ : building std::string from character buffers
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload