Enum has no buffer

[imtrobin]

Hi, I tested with enum with default value 0, the buffer stored is empty. v0.9.9

Repro

#include "SimpleBinStream/SimpleBinStream.h"
#include <iostream>
#include <sstream>
using namespace std;

enum TestEnum : unsigned char
{
	  EnumOne
	, EnumTwo
	, EnumThree

// If I use this, then the buffer shows out properly
// 	 EnumOne    = 1 
// 	, EnumTwo   = 2 
// 	, EnumThree = 3

	, End
};

int main (int argc, char * argv [])
{
	simple::mem_ostream <std::true_type>  out;

	// this is problem
	out << TestEnum::EnumOne;
	// this is fine
	//out << TestEnum::EnumOne;

	const char * buffer = reinterpret_cast <const char*> (out.get_internal_vec ().data ());
	int buffersize = out.get_internal_vec ().size ();

	// Output buffer here is nothing unless I assign values to the enum
 	cout << "out\nBufferSize:" << buffersize << " buffer:" << buffer << "*" << endl;
	return 0;
}

[shaovoon]

I do not have access to C++ compiler now. I'll test when I get home. Zero is NULL terminator in char array and strings. Possible that your string is terminated by NULL. You should try to compare the enum to the original enum and see if the values are the same.

[imtrobin]

the string terminating char shold be '\0', not 0.

[shaovoon]

You can run the code below in cpp.sh or other online C++ compiler.

#include <iostream>

int main()
{
  if('\0' == 0)
  {
    std::cout << "same" << std::endl;
  }
  else
  {
    std::cout << "diff" << std::endl;
  }
  return 0;  
}

[shaovoon]

There are size differences between '\0' and 0.

'\0' is 1 byte zero while literal 0 in source code is usually translated to at least 4 bytes.

[imtrobin]

the value of '\0' is 0 so comparing it to 0 will be same ,but I think in case of enum as value 0, should be different.

[shaovoon]

But you cast it to const char*

[imtrobin]

yes, so that I can serialize it over network. I would expect the enum to be a 0, even if I changed the enum to be of type int, I think same result (I don't have compiler now)