Question

我一直在尝试复制比https://github.com/google/flatbuffers/blob/master/samples/sample_binary.cpp

中的C ++示例更简单的内容。

但是我在VS2017中遇到了一些编译错误

//auto pos = compare->pos;
//auto two = compare->deviceType;
//auto desc = compare->description;

如果我将其注释掉，它将编译并运行。如果没有，则出现以下错误：

Severity    Code    Description Project File    Line    Suppression State
Error   C3867   'PNT::PseudoGPS::pos': non-standard syntax; use '&' to create a pointer to member   LinkWareMessageBus  d:\source\linkwaremessagebus\linkwaremessagebus.cpp 50  
Error   C3867   'PNT::PseudoGPS::deviceType': non-standard syntax; use '&' to create a pointer to member    LinkWareMessageBus  d:\source\linkwaremessagebus\linkwaremessagebus.cpp 51  
Error   C3867   'PNT::PseudoGPS::description': non-standard syntax; use '&' to create a pointer to member   LinkWareMessageBus  d:\source\linkwaremessagebus\linkwaremessagebus.cpp 52

这是我的FBS对象的定义：

// Example IDL file for the PNT Schema
namespace PNT;
enum DeviceType:byte { IMU, VAN, GPS, MAGNAV, SOOP }
struct Vec3 {
  x:float;
  y:float;
  z:float;
}
table PseudoGPS {
  pos:Vec3; 
  deviceType:DeviceType = GPS;
  description: string;
}

root_type PseudoGPS;

这是创建FB对象然后尝试访问事物的代码（我现在只是在探索，代码尚未完成）。

flatbuffers::FlatBufferBuilder builder(1024);
auto position = PNT::Vec3(4.0, 5.0, 6.0);
auto description = builder.CreateString("Magnetic Postion");
auto msg = PNT::CreatePseudoGPS(builder, &position, PNT::DeviceType_MAGNAV, description);
builder.Finish(msg);
uint8_t *buf = builder.GetBufferPointer();
int size = builder.GetSize();

auto compare = PNT::GetPseudoGPS(buf);
auto pos = compare->pos;
auto two = compare->deviceType;
auto desc = compare->description;

Answer 1

compare->pos是指访问器函数，请尝试附加()

flatbuffers示例在VS2017中进行编译时给出非标准语法错误

1 个答案: