Jun 18, 2015 at 7:15am Jun 18, 2015 at 7:15am UTC
How to solve the Template compile error
Hello everyone,
I have a error when i compile my code which using c++ template, the code as follows:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
// ConsoleApplication2.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include <map>
#include <string>
#include <memory>
template <class T >
struct ExpressionTrait ;
class IA
{
public :
virtual void func() = 0;
};
class A : public IA
{
public :
void func()
{
std::cout << "sdfdsf" << std::endl;
}
};
template <>
struct ExpressionTrait <A >
{
typedef IA parentType;
static const int max = 100;
static const int min = 1;
};
template <typename ExpressionObject >
class ExpressionFactory
{
public :
static ExpressionFactory<ExpressionObject >& Instance()
{
static ExpressionFactory<ExpressionObject > instance;
return instance;
}
typedef std:: map< int , int > RegisterCreatorMap;
template < typename T>
void registerCreator()
{
std::cout << "sdfdsf" << std::endl;
creatorMap_.insert(std::make_pair( ExpressionTrait<T >::max,
ExpressionTrait<T >::min));
}
int createExpression( int type)
{
typename RegisterCreatorMap::iterator typeIter = creatorMap_.find(type);
if (typeIter != creatorMap_.end())
{
int creator = typeIter ->second;
return creator;
}
return -1;
}
RegisterCreatorMap creatorMap_;
};
template <class T >
struct ExpressionFactoryAutoRegister
{
ExpressionFactoryAutoRegister()
{
// This line cannot be compiled
ExpressionFactory<typename ExpressionTrait<T >::parentType >::Instance().registerCreator<T>();
}
};
int _tmain (int argc , _TCHAR * argv [])
{
ExpressionFactoryAutoRegister<A> temp;
//ExpressionFactory<IA>::Instance().registerCreator<A>();
int a = ExpressionFactory<IA >::Instance().createExpression(100);
getchar();
return 0;
}
I can compile this code in VS2015, but cannot compile by GCC, the error message is :
ExpressionFactory.hpp:156:107: error: expected primary-expression before '>' token
ExpressionFactoryT<typename ExpressionTrait<T >::parentType >::Instance().registerCreator<T>();
^
/containers/lewguo/lewguo/rootfs/home/lewguo/s/scfupgrade/src/rules/DependenceModParamConditionalExpressionRelative/ExpressionFactory.hpp:156:109: error: expected primary-expression before ')' token
ExpressionFactoryT<typename ExpressionTrait<T >::parentType >::Instance().registerCreator<T>();
Could you help me please? Thanks:)
Last edited on Jun 18, 2015 at 7:53am Jun 18, 2015 at 7:53am UTC
Jun 18, 2015 at 9:05am Jun 18, 2015 at 9:05am UTC
Thanks, it works! :)
and 'static const' intger value can be initialized like
static const int max = 100;
Thanks you again:)