我正在尝试将avro字节流反序列化为scala case类对象。基本上,我有一个带有avro编码数据流的kafka流,现在向模式中添加了一个,我正在尝试更新scala case类以包括新字段。case类如下所示 /** Case class to hold the Device data. */ sw_version: String, reading: Double,
但是由于以下错误,这段代码无法编译:xxx.cpp:4:31: note: in instantiation of template class 's<3, 5, -251>' requested here
xxx.cpp:4:31: note: in instantiation of templat
(78): error: class "test_struct" has no member "result_type" instantiationof class "std::_Weak_result_type<_Functor> [with _Functor=test_struct]" instantiationof class "std::_Re
是否可能有一个可变的"is_instantiation_of__ntp<...>“(NTP代表非类型参数),它将接受具有任意数量的异构非类型参数的模板?我甚至编写了一个测试用例,演示了这些特殊情况(用gcc 4.7.0编译),以便更好地了解我在说什么:{
// is_instantiation_oftemplate< template<typename...> class Template, ty
{};
{ << "is Base_D1 derived from or a template instantiation<< isDerivedFrom<Base, Base_D2>::value << "\n"
<< "is Base_D1_D1 derived from or a template instantiation