C2000 v6.4.9: Issue with templates

stevenh

Guru 20035 points

Hello,

I am using C2000 compilier version v6.4.9.

I am trying to create a generic circular buffer using c++ templates

3755.TestCircularbufferTemplate.zip

The attached project generates the following compiler error:

void CircularBuffer::vPut<T1>(const T1 &) [with T1=unsigned char [32]] ./main.obj

How can I fix the error?

Does the standard library already have a generic circular buffer class?

Thanks,

Stephen

over 9 years ago

0 stevenh over 9 years ago

Guru 20035 points

Ok, I found I found some information at However, my implementation doesn't seem to work.

Please see attached project. TestCircularbufferTemplate3.zip

It works without a template (i.e. foo(records)), why isn't it working with the template (i.e. recordsCircularBuffer.vPut(record).

Stephen

0 stevenh over 9 years ago

Guru 20035 points

Thanks for the info,

I still get the error, i.e.

 undefined                                                                               first referenced
  symbol                                                                                     in file     
 ---------                                                                               ----------------
 void CircularBuffer::vPut<T1, N2>(const T1 (&)[N2]) [with T1=unsigned char, N2=(int)32] ./main.obj

after I moved the template function to the header file, i.e.:

#ifndef CIRCULAR_BUFFER_H
#define CIRCULAR_BUFFER_H

class CircularBuffer
{
public:
    CircularBuffer(void);
    template <typename T, int size>
    void vPut(const T (&array)[size]); // Adds data to circular buffer
};

#if 1
template <typename T, int size>
void foo(T (&array)[size])
{
 //sort array, find the sum, min, max, etc
}
#endif

#endif /* CIRCULAR_BUFFER_H */

However, the program compiles without errors if remove the template function from the cpp file and define it in the class, i.e.

#ifndef CIRCULAR_BUFFER_H
#define CIRCULAR_BUFFER_H

class CircularBuffer
{
public:
    CircularBuffer(void);
    template <typename T, int size>
    void vPut(const T (&array)[size]){}; // Adds data to circular buffer
};

#endif /* CIRCULAR_BUFFER_H */

Anyone at TI have any answers?

Stephen

0 Archaeologist over 9 years ago in reply to stevenh

TI__Guru* 84225 points

You must place the definition (body) of the template function vPut in the header file, not foo.

0 stevenh over 9 years ago in reply to Archaeologist

Guru 20035 points

Thanks for the reply.

I edited my previous post to change "When I move the template function to the header file, i.e.:" to "after I moved the template function to the header file, i.e.:"

Ok, your suggestion fixed it. I had accidentally moved the foo function to the header file.

The attached zip file contains the project that compiles without errors.

TestCircularbufferTemplate4.zip

Thanks,

Stephen

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C2000 v6.4.9: Issue with templates