Linked Questions

At the 2016 Oulu ISO C++ Standards meeting, a proposal called Inline Variables was voted into C++17 by the standards committee. In layman's terms, what are inline variables, how do they work and what ...

See subject. What were they thinking? UPDATE: Changed from "static" to "internal linkage" to save confusion. To give an example... Putting the following in a file: const int var_a = 1; int var_b = ...

Is it possible to declare a variable extern constexpr and define it in another file? I tried it but the compiler gives error: Declaration of constexpr variable 'i' is not a definition in .h: ...

I have a namespace foo which contains an integer bar, declared so... foo.h: namespace foo { int bar; } Now if I include foo.h in only one file, this works just fine. But a problem arises when I ...

I want to share certain C string constants across multiple c files. The constants span multiple lines for readability: const char *QUERY = "SELECT a,b,c " "FROM table..."; Doing ...

// MyClass.h namespace MyNamespace { static const double GasConstant = 1.987; class MyClass { // constructors, methods, etc. }; } I previously had GasConstant declared within the ...

I have the following three files in my code (with most of the code removed. This is just to isolate the issue). global.h: //global.h #ifndef GLOBAL_H #define GLOBAL_H extern const int ARRAYSIZEX; ...

I know there is another post here that is how to clear a single bit, but how about a whole byte? For example, if I had 00000000 00000000 00101100 11000100 and I wanted to clear the second chunk so it ...

We have a piece of C-code in our system which contains a few arrays like this with global access: source.h extern const int magic[5]; source.c: const int magic[] = { 1, 2, 3, 4, 5}; Somebody ...

I try to use a global variable as elements for an array. The problem is that the compiler want to know the integer constant value while declaring an array. I thought that my global variable is ...

I am creating an component, generalization of a template. For creation must be used string identifier. I am replacing: #define MYCOMPONENT_CONSTANT_IDENTIFIER "ID value" with namespace ...

If I have a string variable in a header file which will be used across different files and translation units, should I store it in a constexpr const char* or const std::string? Here is an example: // ...