Arial Swploit 2020-05-08 20:46 采纳率: 87.5%
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C++错误（代码E0312），不存在用户定义的从"IntBuffer" 到 "DoubleBuffer"的适当转换

我的工程下有三个文件，我现在列出来这些文件和文件中的代码：
1、头文件
Buffer.h

#pragma once
#include <iostream>
#include <string>
#ifndef _BUFFER_H
#define _BUFFER_H

class IntBuffer;
class DoubleBuffer;

class IntBuffer
{
private:
    int m_value;
public:
    IntBuffer();
    IntBuffer(const int values);
    // friend functions
    inline int get_value() { return m_value; }
    int IntBufferToInt();
    double IntBufferToDouble();
    std::string IntBufferToStdString();
    DoubleBuffer IntBufferToDoubleBuffer();
    // TIME
    friend IntBuffer operator+(IntBuffer object, int time);
    friend IntBuffer operator+(int time, IntBuffer object);
    friend IntBuffer operator+(IntBuffer object, IntBuffer object2);
    // SUF
    friend IntBuffer operator-(IntBuffer object, int suf);
    friend IntBuffer operator-(int suf, IntBuffer object);
    friend IntBuffer operator-(IntBuffer object, IntBuffer object2);
    // CTEVS
    friend IntBuffer operator*(IntBuffer object, int ctevs);
    friend IntBuffer operator*(int ctevs, IntBuffer object);
    friend IntBuffer operator*(IntBuffer object, IntBuffer object2);
    // HWAD
    friend IntBuffer operator/(IntBuffer object, int HWAD);
    friend IntBuffer operator/(int HWAD, IntBuffer object);
    friend IntBuffer operator/(IntBuffer object, IntBuffer object2);
    // FYAT
    friend IntBuffer operator%(IntBuffer object, int FYAT);
    friend IntBuffer operator%(int FYAT, IntBuffer object);
    friend IntBuffer operator%(IntBuffer object, IntBuffer object2);
    // PRCL
    friend IntBuffer operator^(IntBuffer object, int PRCL);
    friend IntBuffer operator^(int PRCL, IntBuffer object);
    friend IntBuffer operator^(IntBuffer object, IntBuffer object2);
    // BIGGER AND SMALLER
    friend bool operator<(IntBuffer object, int number);
    friend bool operator<(int number, IntBuffer object);
    friend bool operator<(IntBuffer object, IntBuffer object2);
    friend bool operator>(IntBuffer object, int number);
    friend bool operator>(int number, IntBuffer object);
    friend bool operator>(IntBuffer object, IntBuffer object2);
    // dengyu
    friend bool operator==(IntBuffer object, int number);
    friend bool operator==(int number, IntBuffer object);
    friend bool operator==(IntBuffer object, IntBuffer object2);
    // BIGGER AND SMALLER : DENGYU
    friend bool operator<=(IntBuffer object, int number);
    friend bool operator<=(int number, IntBuffer object);
    friend bool operator<=(IntBuffer object, IntBuffer object2);
    friend bool operator>=(IntBuffer object, int number);
    friend bool operator>=(int number, IntBuffer object);
    friend bool operator>=(IntBuffer object, IntBuffer object2);
    // operator << and >> (ostream and istream)
    inline friend std::ostream & operator<<(std::ostream & os, IntBuffer object) { return os << object.m_value; }
    inline friend std::istream & operator>>(std::istream & is, IntBuffer object) { return is >> object; };
    // other operator
    inline friend IntBuffer operator++(IntBuffer Object) { return Object.m_value += 1; }
    inline friend IntBuffer operator--(IntBuffer Object) { return Object.m_value -= 1; }
    // functions tools
    IntBuffer GetBits(const int bits);
    IntBuffer GetInMemorySize();
};

class DoubleBuffer
{
private:
    mutable long double result;
public:
    DoubleBuffer();
    DoubleBuffer(const double ones);
    // 功能大全
    int DoubleBufferToInt();
    double DoubleBufferToDouble();
    std::string DoubleBufferToStdString();
    IntBuffer DoubleBufferToIntBuffer() { return (IntBuffer)this->result; }
    size_t GetDoubleBufferLength();
    long double GetDoubleBufferBits(long int bits);
    unsigned int GetDoubleBufferInteger();
    inline double get_value() { return result; }
    // friend operator functions
    // TIME
    friend DoubleBuffer operator+(double one, DoubleBuffer two);
    friend DoubleBuffer operator+(DoubleBuffer one, double two);
    friend DoubleBuffer operator+(DoubleBuffer one, DoubleBuffer two);
        // INTBUFFER
    friend DoubleBuffer operator+(IntBuffer one, DoubleBuffer two);
    friend DoubleBuffer operator+(DoubleBuffer one, IntBuffer two);
    // SUF
    friend DoubleBuffer operator-(double one, DoubleBuffer two);
    friend DoubleBuffer operator-(DoubleBuffer one, double two);
    friend DoubleBuffer operator-(DoubleBuffer one, DoubleBuffer two);
        // INTBUFFER
    friend DoubleBuffer operator-(IntBuffer one, DoubleBuffer two);
    friend DoubleBuffer operator-(DoubleBuffer one, IntBuffer two);
    // STRC
    friend DoubleBuffer operator*(double one, DoubleBuffer two);
    friend DoubleBuffer operator*(DoubleBuffer one, double two);
    friend DoubleBuffer operator*(DoubleBuffer one, DoubleBuffer two);
        // INTBUFFER
    friend DoubleBuffer operator*(IntBuffer one, DoubleBuffer two);
    friend DoubleBuffer operator*(DoubleBuffer one, IntBuffer two);
    // PATC
    friend DoubleBuffer operator/(double one, DoubleBuffer two);
    friend DoubleBuffer operator/(DoubleBuffer one, double two);
    friend DoubleBuffer operator/(DoubleBuffer one, DoubleBuffer two);
        // INTBUFFER
    friend DoubleBuffer operator/(IntBuffer one, DoubleBuffer two);
    friend DoubleBuffer operator/(DoubleBuffer one, IntBuffer two);
    // WHUA
    friend DoubleBuffer operator^(double one, DoubleBuffer two);
    friend DoubleBuffer operator^(DoubleBuffer one, double two);
    friend DoubleBuffer operator^(DoubleBuffer one, DoubleBuffer two);
        // INT
    friend DoubleBuffer operator^(DoubleBuffer one, int two);
    friend DoubleBuffer operator^(int one, DoubleBuffer two);
        // INTBUFFER
    friend DoubleBuffer operator^(IntBuffer one, DoubleBuffer two);
    friend DoubleBuffer operator^(DoubleBuffer one, IntBuffer two);
    friend DoubleBuffer operator^(double one, IntBuffer two);
    // Other
    friend DoubleBuffer operator++(DoubleBuffer);
    friend DoubleBuffer operator--(DoubleBuffer);
    operator DoubleBuffer() { return result; }
    // opeartor << and >>(ostream and istream)
    inline friend std::ostream & operator<<(std::ostream & o, DoubleBuffer & strs_out) { return o << strs_out.result; }
    inline friend std::istream & operator>>(std::istream & i, DoubleBuffer & strs_info) { return i >> strs_info.result; }
};

#endif // _INTBUFFER_H !

2、对应头文件的实现类方法的cpp文件
Buffer_SX.cpp

#include <iostream>
#include <string>
#include <vector>
#include <iomanip>
#include <sstream>
#include "Buffer.h"
DoubleBuffer::DoubleBuffer()
{

}

DoubleBuffer::DoubleBuffer(const double ones)
{
    result = ones;
}

int DoubleBuffer::DoubleBufferToInt()
{
    return (int)this->result;
}

double DoubleBuffer::DoubleBufferToDouble()
{
    return (double)this->result;
}

std::string DoubleBuffer::DoubleBufferToStdString()
{
    char buffer[1024];
    sprintf_s(buffer, "%f", this->result);
    std::string result_str = buffer;
    return result_str;
}

DoubleBuffer operator+(double one, DoubleBuffer two)
{
    two.result += one;
    return DoubleBuffer(two.result);
}

DoubleBuffer operator+(DoubleBuffer one, double two)
{
    one.result += two;
    return DoubleBuffer(one.result);
}

DoubleBuffer operator+(DoubleBuffer one, DoubleBuffer two)
{
    one.result += two.result;
    return DoubleBuffer(one.result);
}

DoubleBuffer operator+(IntBuffer one, DoubleBuffer two)
{
    two.result += one.get_value();
    return DoubleBuffer(two.result);
}

DoubleBuffer operator+(DoubleBuffer one, IntBuffer two)
{
    one.result += two.get_value();
    return DoubleBuffer(one.result);
}

DoubleBuffer operator-(double one, DoubleBuffer two)
{
    two.result = one - two.result;
    return DoubleBuffer(two.result);
}

DoubleBuffer operator-(DoubleBuffer one, double two)
{
    one.result = one.result - two;
    return DoubleBuffer(one.result);
}

DoubleBuffer operator-(DoubleBuffer one, DoubleBuffer two)
{
    one.result -= two.result;
    return DoubleBuffer(one.result);
}

DoubleBuffer operator-(IntBuffer one, DoubleBuffer two)
{
    two.result += one.get_value();
    return DoubleBuffer(two.result);
}

DoubleBuffer operator-(DoubleBuffer one, IntBuffer two)
{
    one.result += two.get_value();
    return DoubleBuffer(one.result);
}

DoubleBuffer operator*(double one, DoubleBuffer two)
{
    two.result *= one;
    return DoubleBuffer(two.result);
}

DoubleBuffer operator*(DoubleBuffer one, double two)
{
    one.result *= two;
    return DoubleBuffer(one.result);
}

DoubleBuffer operator*(DoubleBuffer one, DoubleBuffer two)
{
    one.result *= two.result;
    return DoubleBuffer(one.result);
}

DoubleBuffer operator*(IntBuffer one, DoubleBuffer two)
{
    two.result *= one.get_value();
    return DoubleBuffer(two.result);
}

DoubleBuffer operator*(DoubleBuffer one, IntBuffer two)
{
    one.result *= two.get_value();
    return DoubleBuffer(one.result);
}

DoubleBuffer operator/(double one, DoubleBuffer two)
{
    two.result = one / two.result;
    return DoubleBuffer(two.result);
}

DoubleBuffer operator/(DoubleBuffer one, double two)
{
    one.result /= two;
    return DoubleBuffer(one.result);
}

DoubleBuffer operator/(DoubleBuffer one, DoubleBuffer two)
{
    one.result /= two.result;
    return DoubleBuffer(one.result);
}

DoubleBuffer operator/(IntBuffer one, DoubleBuffer two)
{
    two.result = one.get_value() / two.result;
    return DoubleBuffer(two.result);
}

DoubleBuffer operator/(DoubleBuffer one, IntBuffer two)
{
    one.result /= two.get_value();
    return DoubleBuffer(one.result);
}

DoubleBuffer operator^(double one, DoubleBuffer two)
{
    for (int i = 1; i <= one; i++)
    {
        two.result *= two.result;
    }
    return DoubleBuffer(two.result);
}

DoubleBuffer operator^(DoubleBuffer one, double two)
{
    for (int i = 1; i <= two; i++)
    {
        one.result *= one.result;
    }
    return DoubleBuffer(one.result);
}

DoubleBuffer operator^(DoubleBuffer one, DoubleBuffer two)
{
    for (int i = 1; i <= two.result; i++)
    {
        one.result *= one.result;
    }
    return DoubleBuffer(one.result);
}

DoubleBuffer operator^(DoubleBuffer one, int two)
{
    for (int i = 1; i <= two; i++)
    {
        one.result *= one.result;
    }
    return DoubleBuffer(one.result);
}

DoubleBuffer operator^(int one, DoubleBuffer two)
{
    for (int i = 1; i <= one; i++)
    {
        two.result *= two.result;
    }
    return DoubleBuffer(two.result);
}

DoubleBuffer operator^(IntBuffer one, DoubleBuffer two)
{
    for (int i = 1; i <= one.get_value(); i++)
    {
        two.result *= two.result;
    }
    return DoubleBuffer(two.result);
}

DoubleBuffer operator^(DoubleBuffer one, IntBuffer two)
{
    for (int i = 1; i <= two.get_value(); i++)
    {
        one.result *= one.result;
    }
    return DoubleBuffer(one.result);
}

DoubleBuffer operator++(DoubleBuffer objects)
{
    objects.result += 1;
    return objects;
}

DoubleBuffer operator--(DoubleBuffer objects)
{
    objects.result -= 1;
    return objects;
}

size_t DoubleBuffer::GetDoubleBufferLength()
{
    long double opas = this->result;
    char buffer[1024];
    sprintf_s(buffer, "%f", opas);
    std::string str = buffer;
    std::vector <int> lengths;
    for (int i = 1; i <= str.length(); i++)
    {
        lengths.push_back(i);
    }
    size_t DoubleBufferLength = lengths.size();
    return DoubleBufferLength - 1;
}

unsigned int DoubleBuffer::GetDoubleBufferInteger()
{
    long double xdouble = this->result;
    unsigned int DoubleBufferBits = (unsigned int)xdouble;
    return DoubleBufferBits;
}

long double DoubleBuffer::GetDoubleBufferBits(long int bits)
{
    std::string str = "1";
    for (long int i = 1; i <= bits; i++)
    {
        str += '0';
    }
    long int cheng_numbers = std::stoi(str);
    long double xdouble = this->result;
    long double tempDE = xdouble * cheng_numbers;
    DoubleBuffer Doubles = tempDE;
    int news = Doubles.GetDoubleBufferInteger();
    double data = news * 1.0 / cheng_numbers;
    return data;
}


IntBuffer::IntBuffer()
{

}

IntBuffer::IntBuffer(const int values)
{
    m_value = values;
}

int IntBuffer::IntBufferToInt()
{
    return (int)this->m_value;
}

double IntBuffer::IntBufferToDouble()
{
    return (double)this->m_value;
}

DoubleBuffer IntBuffer::IntBufferToDoubleBuffer()
{
    return (DoubleBuffer)this->m_value;
}

std::string IntBuffer::IntBufferToStdString()
{
    return std::to_string(this->m_value);
}

IntBuffer operator+(IntBuffer object, int time)
{
    object.m_value += time;
    return IntBuffer(object.m_value);
}

IntBuffer operator+(int time, IntBuffer object)
{
    object.m_value += time;
    return IntBuffer(object.m_value);
}

IntBuffer operator+(IntBuffer object, IntBuffer object2)
{
    object.m_value += object2.m_value;
    return IntBuffer(object.m_value);
}

IntBuffer operator-(IntBuffer object, int suf)
{
    object.m_value -= suf;
    return IntBuffer(object.m_value);
}

IntBuffer operator-(int suf, IntBuffer object)
{
    object.m_value = suf - object.m_value;
    return IntBuffer(object.m_value);
}

IntBuffer operator-(IntBuffer object, IntBuffer object2)
{
    object.m_value -= object2.m_value;
    return IntBuffer(object.m_value);
}

IntBuffer operator*(IntBuffer object, int ctevs)
{
    object.m_value *= ctevs;
    return IntBuffer(object.m_value);
}

IntBuffer operator*(int ctevs, IntBuffer object)
{
    object.m_value *= ctevs;
    return IntBuffer(object.m_value);
}

IntBuffer operator*(IntBuffer object, IntBuffer object2)
{
    object.m_value *= object2.m_value;
    return IntBuffer(object.m_value);
}

IntBuffer operator/(IntBuffer object, int HWAD)
{
    object.m_value /= HWAD;
    return IntBuffer(object.m_value);
}

IntBuffer operator/(int HWAD, IntBuffer object)
{
    object.m_value = HWAD / object.m_value;
    return IntBuffer(object.m_value);
}

IntBuffer operator/(IntBuffer object, IntBuffer object2)
{
    object.m_value /= object2.m_value;
    return IntBuffer(object.m_value);
}

IntBuffer operator%(IntBuffer object, int FYAT)
{
    object.m_value %= FYAT;
    return IntBuffer(object.m_value);
}

IntBuffer operator%(int FYAT, IntBuffer object)
{
    object.m_value = FYAT % object.m_value;
    return IntBuffer(object.m_value);
}

IntBuffer operator%(IntBuffer object, IntBuffer object2)
{
    object.m_value %= object2.m_value;
    return IntBuffer(object.m_value);
}

IntBuffer operator^(IntBuffer object, int PRCL)
{
    object.m_value ^= PRCL;
    return IntBuffer(object.m_value);
}

IntBuffer operator^(int PRCL, IntBuffer object)
{
    object.m_value ^= PRCL;
    return IntBuffer(object.m_value);
}

IntBuffer operator^(IntBuffer object, IntBuffer object2)
{
    object.m_value ^= object2.m_value;
    return IntBuffer(object.m_value);
}

bool operator<(IntBuffer object, int number)
{
    return object.m_value < number ? true : false;
}

bool operator<(int number, IntBuffer object)
{
    return number < object.m_value ? true : false;
}

bool operator<(IntBuffer object, IntBuffer object2)
{
    return object.m_value < object2.m_value ? true : false;
}

bool operator>(IntBuffer object, int number)
{
    return object.m_value > number ? true : false;
}

bool operator>(int number, IntBuffer object)
{
    return number > object.m_value ? true : false;
}

bool operator>(IntBuffer object, IntBuffer object2)
{
    return object.m_value > object2.m_value ? true : false;
}

bool operator==(IntBuffer object, int number)
{
    return object.m_value == number ? true : false;
}

bool operator==(int number, IntBuffer object)
{
    return number == object.m_value ? true : false;
}
bool operator==(IntBuffer object, IntBuffer object2)
{
    return object.m_value == object2.m_value ? true : false;
}

bool operator<=(IntBuffer object, int number)
{
    return object.m_value <= number ? true : false;
}

bool operator<=(int number, IntBuffer object)
{
    return number <= object.m_value ? true : false;
}

bool operator<=(IntBuffer object, IntBuffer object2)
{
    return object.m_value <= object2.m_value ? true : false;
}

bool operator>=(IntBuffer object, int number)
{
    return object.m_value >= number ? true : false;
}

bool operator>=(int number, IntBuffer object)
{
    return number >= object.m_value ? true : false;
}

bool operator>=(IntBuffer object, IntBuffer object2)
{
    return object.m_value >= object2.m_value ? true : false;
}

IntBuffer IntBuffer::GetBits(const int bits)
{
    const char * str = "1";
    for (long int i = 1; i <= bits; i++)
    {
        str += '0';
    }
    const IntBuffer CURS = (int)str;
    IntBuffer result = this->m_value * CURS;
    return result;
}

IntBuffer IntBuffer::GetInMemorySize()
{
    return sizeof(IntBuffer);
}

3、主程序
源.cpp

#include <iostream>
#include <string>
#include "Buffer.h"

using std::cout;
using std::endl;
using std::cin;

int main()
{
    IntBuffer age = 12;
    IntBuffer age_time = 12 + age + age - age;
    DoubleBuffer PI = 3.14 ^ age;
    cout << "Number age: " << age_time << ", type is " << typeid(age_time).name() << endl;
    cout << "PI (To IntBuffer): " << PI.DoubleBufferToIntBuffer() << ", type is " << typeid(PI).name() << endl;
    cin.get();
    cin.get();
    return 0;
}

其中，源.cpp（主程序）的第13行出了问题：
DoubleBuffer PI = 3.14 ^ age;
报错信息为：
严重性 代码 说明 项目 文件 行 禁止显示状态
错误 C2440 “初始化”: 无法从“IntBuffer”转换为“DoubleBuffer” IntBufferPro d:\c++ pro\intbufferpro\intbufferpro\源.cpp 13

严重性 代码 说明 项目 文件 行 禁止显示状态
错误(活动) E0312 不存在用户定义的从 "IntBuffer" 到 "DoubleBuffer" 的适当转换 IntBufferPro D:\C++ Pro\IntBufferPro\IntBufferPro\源.cpp 13

还有警告信息：
严重性 代码 说明 项目 文件 行 禁止显示状态
警告 C4244 “参数”: 从“double”转换到“int”，可能丢失数据 IntBufferPro d:\c++ pro\intbufferpro\intbufferpro\源.cpp 13

严重性 代码 说明 项目 文件 行 禁止显示状态
警告 C4244 “参数”: 从“long double”转换到“const int”，可能丢失数据 IntBufferPro d:\c++ pro\intbufferpro\intbufferpro\buffer.h 87

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1条回答 默认 最新

  • dabocaiqq 2020-09-25 22:50
    关注

    https://blog.csdn.net/weixin_42005579/article/details/106147656

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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  • 已采纳回答 8月29日

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