Re: c_str( ) core dumps inside sprintf
Carlos Moreno wrote:
Ulrich Eckhardt wrote:
[...]
ostringstream somevar;
somevar << PREFIX << MIDDLE << SUFIX;
There's still a better way:
std::string s = PREFIX+'/'+MIDDLE+'.'+SUFFIX;
In which ways is this "better" than the previous one?
Less overhead, possibly even just a single dynamic allocation.
Doubtful -- in fact, the string concat version strikes me as a big
no-no, in that there are *four* unnamed temporary string objects
being created (I don't think std::strings use expression templates;
I might be wrong, though); stringstreams are intended to concatenate
things, so I've always assumed the overhead is less.
Your standard library might use expression templates for string
concatenation to avoid intermediate allocations. STLPort use it:
http://stlport.sourceforge.net/News.shtml (grep the page for concat)
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