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What does basic_stream::find_first_of return if it doesn't find anything?

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I know it returns npos, but I can''t find the definition anywhere, and the following code won''t compile :[
string test = "abcde";
if (test.find_first_of('' '', 0) == npos)
{
//do something

}
Is there some bizzare namespace to npos or something?? Thank you for any and all help.

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