hi
I find myself using stringstream all over my code just to build debug messages that I may or may not write to cout later. that is very comfortable while developing but is generally useless for productive code.
so I would like to have some construct that the compiler will remove in the case of NDEBUG. but I dont want to write #ifndef NDEBUG everywhere.
I have tried with this, but seemingly the compiler still cant completely remove NullStream because if I raise the loopcount to something like 10e7 it takes 3 seconds (with MSVS 2005 /O2, even longer with cygwin/gcc344 or ubuntu7.1/gcc413 -O3)
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#include <iostream>
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#include <string>
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#include <sstream>
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using namespace std;
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class NullStream
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{
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public:
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inline const NullStream& operator<< ( const string & s ) const
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{
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return *this;
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}
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inline const NullStream& operator<< ( int& i ) const
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{
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return *this;
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}
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inline const NullStream& operator<< ( unsigned int& i ) const
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{
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return *this;
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}
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};
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inline ostream& operator<<( ostream& o, const NullStream& n)
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{
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return o;
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}
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inline ostream& operator<<( ostream& o, const stringstream& s )
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{
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o << s.str();
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return o;
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}
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#ifdef NDEBUG
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typedef NullStream LogStream;
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#else
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typedef ostringstream LogStream;
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#endif
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void main_logstream()
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{
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cout << __FUNCTION__ << "\n";
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LogStream buf;
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double clock_begin = clock();
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for ( unsigned int i = 0 ; i < 10e7 ; i++ )
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{
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buf << i << " ";
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}
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cout << "buffer: " << buf << "\n";
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cout << "time: " << ( ( clock() - clock_begin ) / CLOCKS_PER_SEC ) << " s\n";
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}
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I had expected that the compiler should be able to see that the body of that loop only consistst of a couple of calls to functions with empty bodies and thus the whole loop can be removed.
Anybody any suggestions?
