Ensure that char pointers always point to the same string literal

Question

Given the code

// somewhere in the program
const char* p1 = \"Hello World\";

// somewhere else in the program
const char* p2 = \"Hello World\";

Answer 1

There is no such requirement. [lex.string]/15:

Whether all string literals are distinct (that is, are stored in nonoverlapping objects) and whether successive evaluations of a string-literal yield the same or a different object is unspecified.

Best you can do is assert() or just avoid repeating yourself and stick the thing in a function:

char const* my_literal() { return "Hello World"; }

char const* p1 = my_literal();
char const* p2 = my_literal();