c extern global variable

Analysis on the usage of http://www.cnblogs.com/rollenholt/archive/2012/03/20/2409046.htmlextern "C" 1. IntroductionC ++ language was originally created as "a better C ", however, this does not mean that the compilation and connection methods used

1. Declaring external variables Modern compilers are generally compiled by file, so at compile time, the global variables defined in each file are Transparent to each other, that is, at compile time, the visible domain of the global variable is

1. Basic explanationExternIt can be placed before a variable or function to indicate that the definition of a variable or function is in another file, prompting the compiler to find its definition in other modules when it encounters this variable

Const, static, extern usage summary, constextern Const application: 1. For the basic declaration const int r = 100; // standard const variable declaration and initialization, the compiler will directly replace it with 100 during compilation after

Mutual reference between C and C ++ functions extern "C" for an in-depth understanding 1. Introduction C ++ language was originally created as "a better C ", however, this does not mean that the compilation and connection methods used by global

1, can local variables and global variable duplicate? A: Yes, the local will screen the overall situation. To use a global variable, you need to use the "::" Local variables can have the same name as global variables, and when referenced within a

The original intention of the C ++ language is "a betterC. as a language compatible with C, C ++ retains a part of the processStyle language features (known as "not completely Ground Object"), so it can define global variables and functions that do

First, let's take a look at the definition of Baidu: Extern "C" contains a double meaning, which can be obtained literally: first, the target is "extern", and second, the target is "C. Let's explain these two meanings in detail. (1) functions or

Recently learning Lua, about LUA compiled place, because Lua is written in C, C language in C + + functions, need to use the extern "C" compile before, seemingly did not touch this knowledge, write a blog to commemorate, by the way the role of the

  assuming the C + + library file is libtest.a and the header file of the library is test.h, write this in test.h: Before and after the function to be exported: extern "C" {void Test_func ();.}    &nbs p;  then use g++ to compile the source file of