不完全类型‘class odb::access::object_traits_impl<Person，(odb：：database_id)1>’的无效使用

Question

我编写了过于简单的odb示例，并从文档中复制所有代码，但是当调用db.persist(john)编译器时说

/usr/include/odb/traits.hxx:在“struct：：object_traits_impl”的实例化中:/usr/include/obase.txx:61:28: required from‘typename odb::object_traits::id_type odb::database::persist_(const typename odb::object_traits::pointer_type&)和T= Person；odb::database_id DB = (odb::database_id)1；typename odb::object_traits::id_type = odb::access::object_traits::id_type；odb::object_traits::pointer_type =Person*‘/usr/odb：：object_traits：：pointer_type/odb/sqlite/database.ixx:47:37: required 37’typename odb::object_traits::id_type odb：：sqlite：：odb：：object_traits：：pointer_type:数据库:持久化(T*)和T= Person；typename odb::object_traits::id_type =odb：：access：：object_traits：：id_type‘odb：：access：：object_traits：：id_type’需要从这里/usr/odb：：access：：object_traits：：id_type/odb/traits.hxx:177:10: error:无效使用不完整类型‘class odb：：access：：object_traits_impl’结构object_traits_impl：

怎么了？

我的密码：

main.cpp

using namespace std;
using namespace odb::core;

int main(int argc, char **argv) {

odb::sqlite::database db("sqlite.db", SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE);

    Person john("John", "Doe", 33);
//    Person jane("Jane", "Doe", 32);
//    Person joe("Joe", "Dirt", 30);

//    odb::transaction t(db.begin());
    db.persist(john);
//    t.commit();

    return 0;
}

Person.h

#pragma db object
class Person
{
public:
    Person (const std::string& first,
            const std::string& last,
            unsigned short age)
            : first_ (first), last_ (last), age_ (age)
    {
    }

    const std::string&
    first () const
    {
        return first_;
    }

    const std::string&
    last () const
    {
        return last_;
    }

    unsigned short
    age () const
    {
        return age_;
    }

    void
    age (unsigned short age)
    {
        age_ = age;
    }

private:
    friend class odb::access;

    Person () {}

#pragma db id auto
    unsigned long id_;

    std::string first_;
    std::string last_;
    unsigned short age_;
};

odb编译命令

odb -dsqlite --generate-query --generate-session --generate-schema --generate-prepared --output -dir/home/mohsen/Desktop/Workstation/Projects/C++/Rubik/cmake-build-debug/odb_gen --hxx-suffix.h --ixx-suffix_inline.h --cxx-suffix.cpp --odb-file-suffix_odbPerson.h

Answer 1

您将得到此错误，因为‘class odb::access::object_traits_impl<Person, (odb::database_id)1>’是在odb生成的文件Person-odb.hxx中定义的。

在"Person-odb.hxx"文件开始时包括main.cpp将解决您的问题。