operator()( bool )をoperator()( T, enable_if< is_same< T, bool > > )にすればキャストが蹴られるから、これとboost::anyを併用するのもアリか
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operator()( bool )をoperator()( T, enable_if< is_same< T, bool > > )にすればキャストが蹴られるから、これとboost::anyを併用するのもアリか