How much effort are you willing to go to? There’s an obnoxiously obscure way to do it but it requires you to set up a dummy directory to hold surrogates for the system headers. OTOH, it doesn’t require any changes in any of your source code. The same technique works equally well for C code. … Read more
You want to include <string> and use std::string: #include <string> #include <iostream> int main() { std::string s = “a string”; std::cout << s << std::endl; } But what you really need to do is get an introductory level book. You aren’t going to learn properly any other way, certainly not scrapping for information online.
The one-definition rule (3.2, [basic.def.odr]) applies differently to classes and functions: 1 – No translation unit shall contain more than one definition of any variable, function, class type, enumeration type, or template. […] 4 – Every program shall contain exactly one definition of every non-inline function or variable that is odr-used in that program […] … Read more
You could use this: A.h #include <B.h> #ifndef A_H #define A_H class A { public: B b1; int m_a; }; #endif // A_H B.h #ifndef B_H #define B_H class A; class B { public: int f(A &a); }; #include <A.h> inline int B::f(A &a) { return a.m_a; } #endif // B_H main.cpp #include <iostream> #include … Read more
This allowed me to avoid Eclipse “Unresolved inclusion” error. In my case I had to find the location of the C++ vector header on my computer (which is a Mac): find /usr/local -name vector -print I found the correct include location in folder “/usr/include/c++/4.2.1”. Then I set my project eclipse settings like so: Project->Properties->C/C++ General->Paths … Read more
stddef.h is the C header. The name size_t is in global namespace in it. <cstddef>, on the other hand, is a C++ header which wraps the C names into std namespace, which is naturally the C++ approach, so if you include <cstddef> and the compiler is compliant you’ll have to use std::size_t . Clearly, in … Read more
The answer depends on what kind of class you’re creating. C++’s compilation model dates back to the days of C, and so its method of importing data from one source file into another is comparatively primitive. The #include directive literally copies the contents of the file you’re including into the source file, then treats the … Read more
First, you have to remove your FacebookSDK.framework from your Project. Then start over again with these 5 steps. DO NOT re-link the framework. Go to Build Phases in your Project Target. In Link Binary With Libraries, click the “+” button. Click on “Add Other…” button Browse your FacebookSDK folder. Generally in ~/Documents/FacebookSDK/ Clik on (select) … Read more
Open your favorite text editor Create a new file named whatever.h Put your function prototypes in it DONE. Example whatever.h #ifndef WHATEVER_H_INCLUDED #define WHATEVER_H_INCLUDED int f(int a); #endif Note: include guards (preprocessor commands) added thanks to luke. They avoid including the same header file twice in the same compilation. Another possibility (also mentioned on the … Read more
python-dev python-dev contains the header files you need to build Python extensions. lxml lxml is a Python C-API extension that is compiled when you do pip install lxml. The lxml sources have at least something like #include <Python.h> in the code. The compiler looks for the header file Python.h during compilation, hence those header files … Read more