下面的代码在 VS2010 上可以正常编译,但在 gcc 4.6.1 下编译失败:
来自 gcc 的错误:
*C:...\Calculator_engine_impl.h|20|错误:不匹配调用 '(std::string {aka std::basic_string}) (__gnu_cxx::__normal_iterator >&, __gnu_cxx::__normal_iterator >&)' |*
#include "stdafx.h"
#include <iostream>
#include "Calculator_engine.h"
int main(int argc, char** argv)
{
QString expression("1+2-3");
auto beg = expression.begin();
auto end = expression.end();
while (beg != end)
{
qDebut() <<
Calculator_engine<>::read_next_token_(beg,end);
}
}
#ifndef CALCULATOR_ENGINE_H
#define CALCULATOR_ENGINE_H
#include <string>
#include <cctype>
using namespace std;
//#include "Incorrect_Expression.h"
template<class Int_T = long long>
class Calculator_engine
{
private:
Calculator_engine();
static Int_T expression(QString exp);
template<class Forward_Iterator>
static Int_T term_(Forward_Iterator& beg,Forward_Iterator& end);
public:
template<class Forward_Iterator>
static QString read_next_token_(Forward_Iterator& beg,Forward_Iterator& end);
public:
static QString calculate(QString exp);
};
#include "Calculator_engine_impl.h"
#endif // CALCULATOR_ENGINE_H
#ifndef CALCULATOR_ENGINE_IMPL_H_INCLUDED
#define CALCULATOR_ENGINE_IMPL_H_INCLUDED
template<class Int_T>
class Calculator_engine;//[Forward decl]
template<class Int_T>
template<class Forward_Iterator>
Int_T Calculator_engine<Int_T>::term_(Forward_Iterator& beg,Forward_Iterator& end)
{
QChar token;
Int_T result;
switch(token)
{
case '*':
break;
case '/':
break;
}
}
template<class Int_T>
QString Calculator_engine<Int_T>::calculate(QString exp)
{
Int_T result;
auto beg = exp.begin();
auto end = exp.end();
while (beg != end)
{
QString term_ = read_next_token_(beg,end);
QChar token = read_next_token_(beg,end);
switch(token)
{
case '-':
result -= term_(beg,end);
break;
case '+':
result += term_(beg,end);
break;
}
}
}
template<class Int_T>
Int_T Calculator_engine<Int_T>::expression(QString exp)
{
}
template<class Int_T>
template<class Forward_Iterator>
QString Calculator_engine<Int_T>::read_next_token_(Forward_Iterator& beg,Forward_Iterator& end)
{
QString result;
while(std::isdigit(*beg))
{
}
return result;
}
#endif // CALCULATOR_ENGINE_IMPL_H_INCLUDED