问题描述
我有一个(对我来说)相当复杂的模板代码结构:
a class shaderProperty of generic type
class IShaderProperty {
public:
virtual〜IShaderProperty(){}
};
struct IShaderMatth; // forward declaration
template< typename ShadeType>
struct ShaderMatth; // forward declaration
template< typename T>
class ShaderProperty:public IShaderProperty
{
public:
template< typename SomeType>
inline T getValue(ShaderMatth< SomeType> * shaderMatth){
pair< map< void *,IShaderMatth> :: iterator,bool& success = shaderMatth-> properties.insert(make_pair((void *)this,ShaderMatth< T>(m_shader)));
assert(success.second);
return m_shader-> shade((ShaderMatth< T> *)&(* success.first));
}
};
和类ShaderMatth,它也是泛型类型,并存储映射,而void *指针用作键实际上是一个指向ShaderProperty的指针。 ShaderMatth代码:
#includeShaderProperty.h
struct IShaderMatth {
virtual〜IShaderMatth(){}
map< void *,IShaderMatth>属性;
...
};
template< class ReturnType>
struct ShaderMatth:public IShaderMatth {
ShaderMatth(IShader< ReturnType> * shaderPtr){shader = shaderPtr};
〜ShaderMatth(void);
IShader< ReturnType> * shader;
};
现在错误发生在函数内联T的第一行T getValue()
我得到一个
错误C2027使用未定义类型'ShaderMatth< ShadeType>'
但我不明白为什么..我有正向声明的模板struct ShaderMatth,
我挂了 - 请帮助:)
转发声明 ShaderMatth
不足以使用代码 shaderMatth - >属性
。
必须在该行之前定义。
I try to get a (for me) rather complex construct of templated code to work.
what i have:a class shaderProperty of generic type
class IShaderProperty {
public:
virtual ~IShaderProperty() {}
};
struct IShaderMatth; //forward declaration
template<typename ShadeType>
struct ShaderMatth;//forward declaration
template <typename T>
class ShaderProperty : public IShaderProperty
{
public:
template <typename SomeType>
inline T getValue(ShaderMatth<SomeType>* shaderMatth){
pair<map<void*, IShaderMatth>::iterator,bool> success = shaderMatth->properties.insert(make_pair((void*)this, ShaderMatth<T>(m_shader)));
assert(success.second);
return m_shader->shade((ShaderMatth<T>*)&(*success.first));
}
};
and the class ShaderMatth, which is also of generic type, and stores a map whereas the void* pointer used as key is actually a pointer to a ShaderProperty. Code for ShaderMatth:
#include "ShaderProperty.h"
struct IShaderMatth {
virtual ~IShaderMatth() {}
map<void*, IShaderMatth> properties;
...
};
template <class ReturnType>
struct ShaderMatth : public IShaderMatth{
ShaderMatth(IShader<ReturnType>* shaderPtr){shader=shaderPtr};
~ShaderMatth(void);
IShader<ReturnType>* shader;
};
now the error occurs on the first line of function inline T getValue()
i get an
Error C2027 use of undefined type 'ShaderMatth<ShadeType>'
but i don't understand why.. I have the forward declaration of templated struct ShaderMatth, and in the second bunch of code i include the first bunch of code, so the forward reference should work out, no?
I'm hanging - please help :)
Forward declaring ShaderMatth
is not enough to use the code shaderMatth->properties
.
It must be defined before that line.
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