This code is fine across all platforms. The string gets compiled into the binary as a static string literal. If you are on windows for example you can even open your .exe with notepad and search for the string itself.
Since it is a static string literal scope does not matter.
String pooling:
One thing to look out for is that in some cases, identical string literals can be “pooled” to save space in the executable file. In this case each string literal that was the same could have the same memory address. You should never assume that it will or will not be the case though.
In most compilers you can set whether or not to use static string pooling for stirng literals.
Maximum size of string literals:
Several compilers have a maximum size for the string literal. For example with VC++ this is approximately 2,048 bytes.
Modifying a string literal gives undefined behavior:
Modifying a string literal should never be done. It has an undefined behavior.
char * sz = "this is a test";
sz[0] = 'T'; //<--- undefined results
Wide string literals:
All of the above applies equally to wide string literals.
Example: L”this is a wide string literal”;
The C++ standard states: (section lex.string)
1 A string literal is a sequence
of characters (as defined in
lex.ccon) surrounded by double quotes, optionally beginning with the
letter L, as in “…” or L”…”. A string literal that does not begin
with L is an ordinary string literal, also referred to as a narrow
string literal. An ordinary string literal has type “array of n
const
char” and static storage duration (basic.stc), where n is the
size
of the string as defined below, and is initialized with the given
characters. A string literal that begins with L, such as L”asdf”,
is
a wide string literal. A wide string literal has type “array of
n
const wchar_t” and has static storage duration, where n is the size
of
the string as defined below, and is initialized with the given charac-
ters.2 Whether all string literals are distinct (that is, are stored in
nonoverlapping objects) is implementation-defined. The effect
of
attempting to modify a string literal is undefined.