21330450   
   From: pete@versatilecoding.com   
      
   On 2012-01-20 22:57:30 +0000, Robin Morris said:   
      
   >   
   > int main() {   
   > 	old_c_function(const_cast(getstring().c_str()))   
   > }   
   >   
   > This code works, and valgrind does not complain about it, but Is there   
   > any chance that the  pointer passed to old_c_function could be   
   > invalidated before old_c_function is done with it?   
      
   No problem here. getstring() returns a temporary object, and that   
   temporary exists until the end of the full expression that it was   
   created in. The c-style string returned by c_str() also exists until   
   the end of the full expression. The full expression here ends at the   
   semi-colon that is missing from the end of the line, i.e., it exists   
   until old_c_function returns.   
      
   --   
     Pete   
   Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The   
   Standard C++ Library Extensions: a Tutorial and Reference   
   (www.petebecker.com/tr1book)   
      
      
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