我在实施我的课程时遇到了麻烦。它应该能够从 std::string 初始化。所以我写了一个副本(?)构造函数:
CVariable (std::string&, const int p_flags = 0);
我正在尝试制作一个 CVariable 对象:
MCXJS::CVariable s_var = (string)"good job";
我收到以下错误:
F:\Projekty\MCXJS\src\main.cpp|8|error: conversion from 'std::string' to non-scalar type 'MCXJS::CVariable' requested|
如何解决?
我正在寻找完全允许以下内容的解决方案:
MCXJS::CVariable s_var = (string)"good job";
编辑:添加(几乎)完整的源代码:
变量.h
#ifndef CVARIABLE_H
#define CVARIABLE_H
#include <string>
#include <sstream>
namespace MCXJS
{
enum VARTYPE
{
STRING = 0,
INT = 1,
FLOAT = 2
};
class CVariable
{
public:
VARTYPE Type () {return m_type;};
std::string& Value () {return m_value;};
bool SetType (VARTYPE);
private:
const int m_flags;
VARTYPE m_type;
std::string m_value;
// ctors and operators
public:
CVariable (const int p_flags = 0);
CVariable (CVariable&, const int);
CVariable (std::string const&, const int);
CVariable (const int&, const int);
CVariable (const float&, const int);
CVariable& operator= (const CVariable&);
CVariable& operator= (const std::string&);
CVariable& operator= (const int);
CVariable& operator= (const float);
};
};
#endif // CVARIABLE_H
变量.cpp
#include "cvariable.h"
using namespace MCXJS;
using namespace std;
CVariable::CVariable (const int p_flags):
m_flags (p_flags)
{};
CVariable::CVariable (CVariable& p_var, const int p_flags = 0):
m_flags (p_flags),
m_type (p_var.Type()),
m_value (p_var.Value())
{};
CVariable::CVariable (std::string const& p_value, const int p_flags = 0):
m_flags (p_flags),
m_type (STRING),
m_value (p_value)
{};
CVariable::CVariable (const int p_value, const int p_flags = 0):
m_flags (p_flags),
m_type (INT)
{
std::ostringstream buffer;
buffer << p_value;
m_value = buffer.str();
};
CVariable::CVariable (const float p_value, const int p_flags = 0):
m_flags (p_flags),
m_type (FLOAT)
{
std::ostringstream buffer;
buffer << p_value;
m_value = buffer.str();
};
主文件
#include "cvariable.h"
#include <iostream>
using namespace std;
int main()
{
MCXJS::CVariable s_var = (string)"good job"; // error
cout << s_var.Value() << '\n';
return 0;
}
编辑:添加枚举 VARPARAM
编辑:好的,上面解决了,现在我有了这个:
cvariable.cpp|12|error: passing 'const MCXJS::CVariable' as 'this' argument of 'MCXJS::VARTYPE MCXJS::CVariable::Type()' discards qualifiers|
cvariable.cpp|13|error: passing 'const MCXJS::CVariable' as 'this' argument of 'std::string& MCXJS::CVariable::Value()' discards qualifiers|