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constructor-is-not-called-in-this-aggregation-class

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Compilation time: 0.65 sec, absolute running time: 0.03 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.85 sec 
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Warning(s):
source_file.cpp:16:8: warning: parentheses were disambiguated as a function declaration [-Wvexing-parse]
    B b(A());  /* no ouput */
       ^~~~~
source_file.cpp:16:9: note: add a pair of parentheses to declare a variable
    B b(A());  /* no ouput */
        ^
        (  )
1 warning generated.