运算符=不从CTimeSpan类继承 [英] operator = doesn't inherited from CTimeSpan class

问题描述

大家好
在将CTimeSpan类继承到我的类CVoipTimeSpan后，运算符="=不被继承，然后我将代码写入继承=" =的运算符为

  const  CVoipTimeSpan& CVoipTimeSpan :: 运算符 =( const  CVoipTimeSpan& entry)
{
    如果(输入！= * 此)
    {
        (CTimeSpan)* 此 =(CTimeSpan)条目；
    }

    返回 * 此；
} 

我在以下语句中测试了此代码

 CTime curr_time;
CVoipTimeSpan time_span;
 int  time_diff_in_secs;
curr_time = CTime :: GetCurrentTime();
time_span = curr_time-database_cache_lookup_time;
time_diff_in_secs = time_span.GetTotalSeconds(); 

运算符-"正确完成，在time_deff_in_secs中我得到"0"，为什么运算符=对我的代码进行了零修改，请回复我. > CTimeSpan::GetTotalSeconds()返回LONG LONG值，但是您将其存储到int，这可能是问题所在.尝试通过调试器运行代码以查看正在生成的值.

您正在尝试定义将CVoipTimeSpan分配给CVoipTimeSpan的运算符. 您需要一个运算符才能将CVoipTimeSpan分配给CTimeSpan.

—SA

Hello all
After inheriting CTimeSpan class to my class CVoipTimeSpan the operater ''='' is not inherited then i write the code to inheriting ''='' operator as

const CVoipTimeSpan& CVoipTimeSpan::operator=(const CVoipTimeSpan& entry)
{
    if (entry != *this)
    {
        (CTimeSpan)*this = (CTimeSpan) entry;
    }

    return *this;
}

i tested this code in following statements

CTime curr_time;
CVoipTimeSpan time_span;
int time_diff_in_secs; 
curr_time = CTime::GetCurrentTime();
time_span = curr_time - database_cache_lookup_time;
time_diff_in_secs = time_span.GetTotalSeconds();

the operator ''-'' done correct and in time_deff_in_secs i got ''0'' why the operator = gives zero any modifications in my code please reply me .

解决方案

CTimeSpan::GetTotalSeconds() returns a LONG LONG value, but you are storing it to an int, this could be the problem. Try running your code through the debugger to see what value is being generated.

You''re trying to define operator for assigning CVoipTimeSpan to CVoipTimeSpan.
You need an operator to assign CVoipTimeSpan to CTimeSpan.

—SA

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