[ ] print::f - A type-safe printf like function.

print::f(std::ostream&, const char* msg, args...)

[ ] print::c - A print::f with replacing std::ostream with std::cout, less typing.

print::c(const char* msg, ...)

[ ] print::d - A print::f with pure result message to OutputDebugString. Very usefull for Windows Developing.

print::d(const char* msg, ...)

print::f(std::cout, "My cat is named %s. %s is %d years old." 
    "Nini", std::string("Nini"), 5);
// print `My cat is named Nini. Nini is 5 years old` into std::cout

print::c("%s eats food %f pounds every day. And %s fat rate is %f%%",
    "Nini", 3.14, "her", 20.0);
// print `Nini eats food 3.14 pounds every day. And her fat rate is 20.0%` on std::cout 

print::d("[Log] name: %s, age: %d, fat rate: %f\n",
    username(), get_age(), get_fatrate());
// equals OutputDebugString("[Log] name: OT, age: 99, fat rate 25\n");

• %s: expect string

  • std::string
  • const char*

• %d: expect integer

  • bool
  • short
  • int
  • ...
  • to long long
  • builtin integers.

• %f: expect floating integers

  • float
  • double
  • long double

• %%: a escape symbol to represent %

1. Any wrong type arguments as wrong position causes compile error.

   print::c("I'm %s.", 123); // static_assert complains arg1(%s) expects string

2. Any wrong amount arguments on given message causes compile error.

   print::c("I'm %s. You're %s", "OT"); // static_assert complains missing arg2.

3. Any unrecongized format symbol e.g. %g %a causes compile error.

   print::c("I'm %a", "OT"); // static_assert complains unknown symbol

• Msg must be a string literal for compile-time arguments amount and type checking.

  print::c(std::string("Herher! %s!"), "HAHA"); // gg
  

• run behavior tests

/path/to/print_root> $ make btest 

• run unit tests

/path/to/print_root> $ make utest 

/path/to/print_root> $ vi src/exp.cpp
/path/to/print_root> $ make exp