小编Car*_*Ost的帖子

我一直在寻找这个问题的解决方案，我认为这是由于嵌套命名空间造成的。

波纹管我们有它的相关部分：

implementation.hpp那是一个接口的实现

#ifndef IMPLEMENTATION_H
#define IMPLEMENTATION_H

#include "class_b.hpp"

namespace XPTO {
class Implementation : public XPTO::Interface {

    public:

        Implementation();
        ~Implementation() override;

        ReturnStatus
        initialize() override;

    private:

        CLASS_B::Class_B b; // namespace CLASS_B, class Class_B
    };
}
#endif

实现.cpp

#include "implementation.hpp"

XPTO::Implementation::Implementation() {}

XPTO::ReturnStatus
XPTO::Implementation::initialize() {
    b = new CLASS_B::Class_B::Class_B(); 
    //namespace ClASS_B, class Class_B and constructor Class_B()
}

class_b.hpp

#ifndef CLASS_B_H
#define CLASS_B_H

namespace CLASS_B{

class Class_B {

    public:

        Class_B();
        ~Class_B();

        void initialize();
    };
}
#endif

错误是 error: expected type-specifier b …

我正在尝试将表从纯 SQL 转换为 Flask-Sqlalchemy，但是可用的文档并不清楚如何执行此特定场景 - 主键也是外键。

构建表的 SQL 如下所示，它工作正常：

CREATE TABLE IF NOT EXISTS `ws`.`Perfil_Plano_Transacao` (
    `pptr_perf_id` INT NOT NULL,
    `pptr_tran_id` INT NOT NULL,
    `pptr_plan_id` INT NOT NULL,
    `pptr_dt_incluscao` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `pptr_dt_atualizacao` TIMESTAMP NULL,
PRIMARY KEY (`pptr_perf_id`, `pptr_tran_id`, `pptr_plan_id`),
INDEX `fk_Perfil_Plano_Transacao_Transacao1_idx` (`pptr_tran_id` ASC),
INDEX `fk_Perfil_Plano_Transacao_Plano1_idx` (`pptr_plan_id` ASC),
CONSTRAINT `fk_Perfil_Plano_Transacao_Perfil1`
    FOREIGN KEY (`pptr_perf_id`)
    REFERENCES `ws`.`Perfil` (`perf_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
CONSTRAINT `fk_Perfil_Plano_Transacao_Transacao1`
    FOREIGN KEY (`pptr_tran_id`)
    REFERENCES `ws`.`Transacao` (`tran_id`)
    ON DELETE NO ACTION
    ON UPDATE …