C++ memory layout of static vs function static vs member function static

Question

Considering 3 different static arrays in some Class.cpp file:

static char array0[8];

/*static*/ char Class::s_array1[8]; //static declared in Header Class.h

void Class::DoStuff()
{
    static char f_array2[8];
}

Is it clearly defined whether the 3 arrays will be contiguous in memory relative to each other, and in which order? (Or does it depend on the compiler/platform)

You can, by getting their memory addresses, and compare/sort them ... but what is the goal ? what do you try to do ? — AntiClimacus
– AntiClimacus, Commented Apr 23, 2014 at 20:53
I mean is it predictable, or does it depend on compiler /platform etc? — skimon
– skimon, Commented Apr 23, 2014 at 20:57

Don Reba · Accepted Answer · 2014-04-23 21:01:17Z

2

Arrays are always contiguous in memory, but it is not defined where they will end up relative to each other.

answered Apr 23, 2014 at 21:01

Don Reba

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AntiClimacus · Accepted Answer · 2014-04-23 21:04:29Z

2

This is fully compiler and platform dependent. In the case it runs on a Linux platform, you can guess that these arrays will be in the .bss section.

Obviously, each array is contiguous in memory. This is mandatory.

answered Apr 23, 2014 at 21:04

AntiClimacus

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