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Choosing between a Null stream and ostringstream

P: 1
#define LOG(level) \
(level > Log::CurrentLevel() ? NullStream(): Log().Get(level))

struct NullStream:std::ostream {
NullStream():std::ios(0), std::ostream(0){}

Log().Get() returns a ostringstream.

The following statement statement gives the below compiler error:
LOG(3) << "logging" << endl;

error: operands to ?: have different types ‘NullStream’ and ‘std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >’

How can I rewrite the Macro LOG?

Aug 28 '10 #1
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1 Reply

Expert Mod 5K+
P: 9,197
What are you trying to do?

The first hint of trouble is that #define. You use those in C a lot but rarely in C++.
Aug 29 '10 #2

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