fedora 20上的boost / lexical_cast

Question

I'am trying to compile and run a C++ program where is included boost/lexical_cast.hpp in fedora 20, where is installed boost-devel 1.50

What I get is as follow:

ina@localhost Examples]$ g++ -I ../Libraries/ quark_prop.cpp
In file included from ../Libraries/mdp.h:177:0,
                 from ../Libraries/fermiqcd.h:15,
                 from quark_prop.cpp:1:
../Libraries/mdp_utils.h:73:51: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
 int is_file(string filename, char permission[]="r") {
                                                   ^
In file included from ../Libraries/fermiqcd.h:15:0,
                 from quark_prop.cpp:1:
/usr/include/boost/assert.hpp: In function ‘void boost::assertion::detail::assertion_failed_msg(const char*, const char*, const char*, const char*, long int)’:
../Libraries/mdp.h:49:14: error: expected unqualified-id before string constant
 #define endl "\n"
              ^
../Libraries/mdp.h:49:14: error: expected ‘;’ before string constant

While in another pc with OS ubuntu 10.04 and boost 1.40 this codes works perfectly.

Any idea of what is happening?

Thank you

Answer 1

Your message is unrelated to boost.

You cannot pass a string literal as char* . It's always const, so pass it as char const* : Live On Coliru

Regarding the other error in mdp.h , you need to show the relevant code

---

UPDATE Ah.

The problem is with the define. It's breaking the compilation of the boost header because mdp.h writes;

std::endl

somewhere, and the preprocessor is making that into

std::"\n"

which isn't valid C++.

Remove the define. Use using instead (but not in header files):

• http://en.cppreference.com/w/cpp/language/using_declaration
• Why is "using namespace std" considered bad practice?