fstream - Imitating fortran print and write syntaxes in C++ -

i trying implement class in c++ imitate syntax of print , write statements fortran.

in order achieve this, implemented class fooprint , overloaded fooprint::operator, (comma operator). since class should print standard output or file, defined 2 macros: print (for stdout) , write (to operate on files).

i compilation errors when trying use write(data) a; (see below error log). how can working write statement above properties?

this code (live demo):

#include <iostream> #include <fstream>  class fooprint {     private:       std::ostream *os;      public:       fooprint(std::ostream &out = std::cout) : os(&out) {}       ~fooprint() { *os << std::endl;}        template<class t>       fooprint &operator, (const t output)       {         *os << output << ' ';         return *this;       } };  #define print      fooprint(),     // last comma calls `fooprint::operator,` #define write(out) fooprint(out),  int main() {   double = 2.0;    print "hello", "world!";        // ok   print "value of =", a;        // ok   print a;                        // ok    std::ofstream data("tmp.txt");   write(data) "writing tmp";   // compiles icpc; doesn't g++    write(data) a;                  // won't compile   data.close();   return 0; } 

and compilation message:

g++ -wall -std=c++11 -o print print.cc    error: conflicting declaration ‘fooprint data’    #define write(out) fooprint(out),                                    ^    note: in expansion of macro ‘write’      write(data) a;      ^    error: ‘data’ has previous declaration ‘std::ofstream data’    error: conflicting declaration ‘fooprint a’      write(data) a;                  ^    error: ‘a’ has previous declaration ‘double a’  icpc -wall -std=c++11 -o print print.cc    error: "data" has been declared in current scope      write(data) a;    error: "a" has been declared in current scope      write(data) a; 

fooprint(out) not creation of temporary rather declaration of variable of type fooprint name provided argument macro. in order not make declaration, , instead expression, 2 quick changes can make surrounding in parenthesis (fooprint(out)) or using brace-initialization (c++11) (fooprint{out}).