Stsstream.h

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#ifndef STSSTREAM_H
#define STSSTREAM_H
#include <ctype.h>
#include "Rstrstream.h"
#ifdef R__SSTREAM
using std::streamsize;

class istrstream : public std::istringstream {
public:
istrstream(): std::istringstream(){}
istrstream(const char *init):std::istringstream(std::string(init)){}
};
#else
#endif 

// Hide the function from `rootcint` as it cannot process variadic template parameters
#ifndef __CINT__

#include <iostream>
#include <cstdio>
#include <memory>
#include <string>

template<typename ... Args>
std::string FormString(const std::string& format, Args ... args)
{
    size_t cstr_size = snprintf(nullptr, 0, format.c_str(), args ...) + 1; // Extra space for '\0'
    std::unique_ptr<char[]> buf(new char[cstr_size]);
    snprintf(buf.get(), cstr_size, format.c_str(), args ...);
    return std::string(buf.get(), buf.get() + cstr_size - 1); // We don't want the '\0' inside
}
#endif

#endif