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  • How do I use extern to share variables between source files?
    First off, the extern keyword is not used for defining a variable; rather it is used for declaring a variable I can say extern is a storage class, not a data type extern is used to let other C files or external components know this variable is already defined somewhere Example: if you are building a library, no need to define global variable
  • using extern template (C++11) to avoid instantiation
    To prevent this, starting with C++0x, one could use the keyword extern in front of the class template specialization #include <MyClass> extern template class CMyClass<int>; The explicit instantion of the template class should happen only in a single translation unit, preferable the one with template definition (MyClass cpp)
  • Why do we need extern C { #include lt;foo. h gt; } in C++?
    For example, if you have a project with 3 files, util c, util h, and main cpp and both the c and cpp files are compiled with the C++ compiler (g++, cc, etc) then it isn't really needed, and may even cause linker errors If your build process uses a regular C compiler for util c, then you will need to use extern "C" when including util h
  • syntax - How does extern work in c++? - Stack Overflow
    extern means "these variables are defined in some other compilation unit ( cpp or lib file)" In this case, you #include <iostream> into your cpp file, and because cin and cout are declared as extern, the compiler will let you use them without complaining Then, when the linker runs, it looks up all of the extern variables and sorts it all out
  • c++ - How to declare constexpr extern? - Stack Overflow
    What you probably want is extern and constexpr initialization, e g : in header extern const int g_n; in cpp constexpr int g_n = 2; This is support though in Visual Studio 2017 only through conformance mode: Zc:externConstexpr (Enable extern constexpr variables) constexpr definition of extern const variable
  • static and extern global variables in C and C++ - Stack Overflow
    If you need a global variable visible on multiple sources and not const, declare it as extern on the header, and then define it, this time without the extern keyword, on a source file: Header included by multiple files: extern int varGlobal; In one of your source files: int varGlobal = 7;
  • C: What is the use of extern in header files? - Stack Overflow
    The extern keyword is used to share variables across translation units When you declare variables in a header file, those variables are already included in the translation unit ( cpp) file that contains the header file Therefore, any C++ file that contains "test1 h" will have internal linkage of the variable one –





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