[英]“incomplete type” error when accessing a template class
我有一個“ SignalProcessingBlock”類,其中包含“ Buffer”模板類。 它們是這樣的:
SignalProcessingBlock.h:
class SignalProcessingBlock{
public:
Buffer <class BufferClass> *InputBuffer;
Buffer <class BufferClass> *OutputBuffer;
SignalProcessingBlock *FrontSignalProcessingBlock;
void Process();
};
SignalProcessingBlock.cpp:
#include "SignalProcessingBlock.h"
void SignalProcessingBlock::Process()
{
double tmp;
for (int i=0;i<(this->InputBuffer->BufferSize/2);i++)
{
this->OutputBuffer->buffer[i] = this->InputBuffer->buffer[i*2];
tmp=this->OutputBuffer->buffer[i];
}
}
Buffer.h:
template <class BufferClass> class Buffer
{
public:
int BufferSize;
BufferClass buffer[];
Buffer (BufferClass *buffer,int BufferSize);
};
Buffer.cpp:
#include "Buffer.h"
template <class BufferClass>
Buffer <BufferClass>::Buffer(BufferClass *buffer,int BufferSize)
{
this->buffer=buffer;
this->BufferSize=BufferSize;
}
甚至在嘗試執行操作之前,我都會出現以下錯誤行:
jni/SignalProcessingBlock.cpp:34:47: error: definition of implicitly-declared 'SignalProcessingBlock::~SignalProcessingBlock()'
In file included from jni/SignalProcessingBlock.h:4:0,
from jni/SignalProcessingBlock.cpp:1:
jni/Buffer.h: In instantiation of 'Buffer<BufferClass>':
jni/SignalProcessingBlock.cpp:42:35: instantiated from here
jni/Buffer.h:9:21: error: 'Buffer<BufferClass>::buffer' has incomplete type
jni/SignalProcessingBlock.h:11:16: error: forward declaration of 'struct BufferClass'
jni/SignalProcessingBlock.cpp: In member function 'void SignalProcessingBlock::Process()':
jni/SignalProcessingBlock.cpp:44:23: error: 'class Buffer<BufferClass>' has no member named 'buffer'
jni/SignalProcessingBlock.cpp:44:54: error: 'class Buffer<BufferClass>' has no member named 'buffer'
jni/SignalProcessingBlock.cpp:45:27: error: 'class Buffer<BufferClass>' has no member named 'buffer'
/cygdrive/d/Development/NDK/android-ndk-r9/build/core/build-binary.mk:348: recipe for target 'obj/local/armeabi-v7a/objs-debug/com_talkitt_beta_NativeWrapper/SignalProcessingBlock.o' failed
make: *** [obj/local/armeabi-v7a/objs-debug/com_talkitt_beta_NativeWrapper/SignalProcessingBlock.o] Error 1
我正在用C ++編寫並使用Eclipse Juno,調試和構建使用ndk-build(“ make”命令包裝器)執行。
我正在做本書中的所有事情,並且不了解錯誤,我確實有“ buffer”成員,並且語法似乎是正確的。
非常感謝您的幫助!
順便說一句,堆棧溢出告訴我由於某種原因我需要添加更多信息,所以我只寫東西
在模板類Buffer
的定義中,標記BufferClass
是模板的參數。 稍后,在聲明要使用的Buffer
對象的類型時,需要專門化模板,或者換句話說,指定要用作模板參數的實際類型。
在您的特定情況下,如果您需要一個包含double
值數組的Buffer
實例,則可以執行以下操作:
#include "Buffer.h"
class SignalProcessingBlock{
public:
Buffer <double> *InputBuffer;
...
另一方面,如果您希望推遲模板專業化,則必須使SignalProcessingBlock
成為模板類:
#include "Buffer.h"
template <class BufferClass> class SignalProcessingBlock{
public:
Buffer <typename BufferClass> *InputBuffer;
...
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