Re: memory lead while using Glib regexp

[Olivier Sessink <oliviersessink gmail com>]

On 03/02/2012 04:00 AM, Xi Yang wrote:
> Hi, everyone!
>
>
> I use Glib's regular expression in a cycle, and find a rapid memory consumption increase. Did I forget to 
> release anything?

since nobody replied I'll give it a shot (without any C++ knowledge):

does seq.header.c_str() return a newly allocated string?


Olivier


> Thanks a lot!
>
>
> ================= code below ======================
>
>
> GRegex* regex_illumina = g_regex_new(
>      "@(.+):(\\d+):(\\d+):(\\d+):(\\d+)#(\\d+)/([12])",
>      G_REGEX_OPTIMIZE,
>      GRegexMatchFlags(0),
>      NULL
> );
>
>
> GRegex* regex_casava_1p8 = g_regex_new(
>      "@(.+):(.+):(.+):(\\d+):(\\d+):(\\d+):(\\d+) ([12]):([YN]):\\d+:(\\w*)",
>      G_REGEX_OPTIMIZE,
>      GRegexMatchFlags(0),
>      NULL
> );
>
>
> // inside cycle body
>          gchar* tile_str;
>          int tile;
>          GMatchInfo* what;
>
>          // match and fetch something
>          if ( g_regex_match(regex_illumina, seq.header.c_str(), GRegexMatchFlags(0),&what) ) {
>              tile_str = g_match_info_fetch(what,3);
>          }
>          else if ( g_regex_match(regex_casava_1p8, seq.header.c_str(), GRegexMatchFlags(0),&what) ) {
>              tile_str = g_match_info_fetch(what,5);
>          }
>          else {
>              throw runtime_error("failed to parse header line:\n"+seq.header);
>          }
>
>
>          // parse a number
>          if (sscanf(tile_str,"%d",&tile)!=1)
>              throw runtime_error("failed to fetch tile from "+seq.header);
>
>
>          // release match info and fetched string
>          g_match_info_free(what);
>          g_free(tile_str);
> // end of cycle body
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