关于c ++：与Template的参数类型/值不匹配

type/value mismatch at argument with Template

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我正在编写一些C++模板代码来替换当前源中的IF条件。这里，我根据两个条件1派生助手数据类型。建议2。单纯形复合体

见以下模板代码：

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template<bool isAdvice, class SH, class CH>
class IfThenElse;

template<class SH, class CH>
class IfThenElse<true, SH, CH>
{
public:
typedef SH Helper;
};

template<class SH, class CH>
class IfThenElse<false, SH, CH>
{
public:
typedef CH Helper;
};

template <bool isAdvice, bool SimpleOrComplex>
class DeriveHelper
{
public:
typedef typename IfThenElse<isAdvice,
IfThenElse<SimpleOrComplex, SimpleHelper, ComplexHelper>::Helper,
IfThenElse<SimpleOrComplex, SimpleNoAdvHelper, ComplexNoAdvHelper>::Helper>::Helper DerivedHelper;

};

但是，在编译时获取此错误：

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template.cpp:135: error: type/value mismatch at argument 2 in template parameter list for 'template<bool isTradeAdvice, class SH, class GH> struct IfThenElse'
template.cpp:135: error: expected a type, got 'IfThenElse::Helper'
template.cpp:135: error: type/value mismatch at argument 3 in template parameter list for 'template<bool isTradeAdvice, class SH, class GH> struct IfThenElse'
template.cpp:135: error: expected a type, got 'IfThenElse::Helper'

有人能提出原因吗？