Affected subclause: [lex.string]
Change: String literals made const
.
The type of a
string-literal is changed
from “array of
char”
to “array of
const char”
.The type of a UTF-8 string literal is changed
from “array of
char”
to “array of
const char8_t”
.The type of a UTF-16 string literal is changed
from “array of
some-integer-type”
to “array of
const char16_t”
.The type of a UTF-32 string literal is changed
from “array of
some-integer-type”
to “array of
const char32_t”
.The type of a wide string literal is changed
from “array of
wchar_t”
to “array of
const wchar_t”
.Rationale: This avoids calling an inappropriate overloaded function,
which might expect to be able to modify its argument
. Effect on original feature: Change to semantics of well-defined feature
. Difficulty of converting: Syntactic transformation
. The fix is to add a cast:
char* p = "abc";
void f(char*) {
char* p = (char*)"abc";
f(p);
f((char*)"def");
}
How widely used: Programs that have a legitimate reason to treat string literal objects
as potentially modifiable memory are probably rare
.