template<
class... Args>
void
operator()(
error_code ec,
Args&& ...);
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void
operator()();
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template<
class Arg0,
class... Args,
[role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type] = typename std::enable_if< ! std::is_convertible<Arg0, error_code>::value>::type>
void
operator()(
Arg0&&,
Args&& ...);
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