It is not a lot to use C Template recently. However, it is necessary to compile on multiple compilers. When I developed, my development environment was Visual Studio 2005. The compile is of course VC 2005. Compile me a few templates have no problems.
Later, the program needs to be compiled under G multiple versions. There is no problem in G 3.x. But when G - 4.0 has multiple nausea compilation errors. Now, it is listed, I hope to provide some clues to the later person. .
1. Template Class Friend problem.
Many times, a template we hope to pack it with TypeDef.
For example, my ResourceManager and HRESOURCE two template classes .ResourceManager To use the protected member in the HRESOURCE template class. So is a natural definition method:
Template
{
Typedef resourcemanager
Friend Class MyResmgr;
PUBLIC:
}
This will work on most compilers. But change to G - 4.0 will report an error. We must write a regulations:
Template
{
Typedef resourcemanager
Friend Class ResourceManager
PUBLIC:
}
I really have enough metamorphosis .....!
2: Template derived class member variable
Template
{
protected:
INT m_size;
}
Template
{
Void foo ()
{
m_size = 0; // The definition of the variable is not found in the G 4.0 report.
this-> m_size; // correct
TBASE
}
}
3: Template derived static member variable problem
/*Singleton.h*/
Template
{
protected:
Static t * ms_psingleton;
}
/*somefile.cpp*/
CsomeClass * csingleton
The correct way of writing is
/*somefile.cpp*/
Template <> csomeclass * csingleton
Or written like this /*singleton.h*/
/*Singleton.h*/
Template
{
protected:
Static t * ms_psingleton;
}
Template
This is no longer written in the CPP file.
I recommend the previous way. But the latter is laborious.
These have been recently found, these are in C books. But it is easy to be ignored.
