TBufferJSON missing member

ROOT
1

Upon running the following code:

std::vector<float> v = {1., 2., 3.};
std::unordered_map<std::string, std::vector<float>> m = {{"str", v}};
auto json = TBufferJSON::ToJSON(&m, TBufferJSON::kMapAsObject);

I am getting

error: 'kMapAsObject' is not a member of 'TBufferJSON'

The same happens with other enum elements.

ROOT Version: 6.14/09

2

You need ROOT 6.18 for “kMapAsObject”.

3

Thank you.
In general, is there any way to check the ROOT version required to use a particular class method/member? Something along the following lines:

ROOT::RequiredMinimumVersion(TBufferJSON::kMapAsObject);
4

I have also just noticed that the class does not work as expected for vectors with dimension higher than 2:

std::vector< std::vector< std::vector< std::vector<float>>>> x;
/* ...
fill x values
... */
std::ofstream o("file.json");
auto json = TBufferJSON::ToJSON(&x);
o << json << std::endl;

only displays two out of the four dimensions.

5

Yes, I can reproduce problem when vector x has exactly one element. In such situation dimension disappears. I will try to fix it.

6

Hi @bfontana ,

Fix is there https://github.com/root-project/root/pull/4290 and will be merged soon into the master.

Thanks for reporting it,
Sergey