valuelistitem.cpp

表达式计算expression evaluate expression evaluate expression evaluate

/******************************************************************************
文件名          :ValueListItem.cpp
版本号          : 1.0
作者            : Amos Peng
生成日期        :2008-07-08
最近修改        :
功能描述        :数值列表项
函数列表        :

*******************************************************************************/
#include "ValueListItem.h"
using namespace ExprEval;
// Constructor for internal value
CValueListItem::CValueListItem(const ::std::string &name, double def, bool constant)
{
    m_name = name;
    m_constant = constant;
    m_value = m_def = def;
    m_ptr = 0;
}

// Constructor for external value    
CValueListItem::CValueListItem(const ::std::string &name, double *ptr, double def, bool constant)
{
    m_name = name;
    m_constant = constant;
    m_value = m_def = def;    
    m_ptr = ptr;
    
    if(m_ptr)
        *m_ptr = def;
    else
        throw(CNullPointerException("ValueListItem::ValueListItem"));        
}    
    
// Get the name
const ::std::string& CValueListItem::GetName() const
{
    return m_name;
}
        
// Return if it is constant
bool CValueListItem::IsConstant() const
{
    return m_constant;
}
    
// Get value address
double* CValueListItem::GetAddress()
{
    return m_ptr ? m_ptr : &m_value;
} 
    
// Reset to default value
void CValueListItem::Reset()
{
    if(m_ptr)
        *m_ptr = m_def;
    else
        m_value = m_def;
}