From: daniel.kruegler@googlemail.com   
      
   On 2011-11-04 00:47, John Wiegley wrote:   
   >>>>>> s5n  writes:   
   >   
   >> foo( std::string("...").c_str() );   
   >   
   >> My question is simply: what is the lifetime of the string temporary object?   
   >> Does it survive until foo() returns or does it expire immediately before   
   >> foo() is called?   
   >   
   >> My point is simply to understand whether or not the above has well- defined   
   >> or undefined behaviour.   
   >   
   > The C++ Standard says, 1.9p17:   
   >   
   >   When calling a function (whether or not the function is inline), there is a   
   >   sequence point after the evaluation of all function arguments (if any)   
   which   
   >   takes place before execution of any expressions or statements in the   
   >   function body.   
   >   
   > One aspect of sequence points is that temporaries get cleaned up.   
      
   I don't think that 12.2 [class.temporary] p3 allows this, it says that   
      
   "Temporary objects are destroyed as the last step in evaluating the   
   full-expression (1.9) that (lexically) contains the point where they   
   were created."   
      
   and the call to foo is part of the full-expression, as defined in 1.9   
   [intro.execution] p10.   
      
   Both VC10 and gcc 4.7.0 seem to agree with that and destroy the   
   temporary after the function call.   
      
   HTH & Greetings from Bremen,   
      
   Daniel Krügler   
      
      
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