Gustavo Lopes wrote:
const char * and char const * are the same (just like const int and
int const are the same); what's not the same is char *const.
Andrey Hristov wrote:
it's easy, whatever const is closer to is immutable
const char * is a pointer to a const char, because the const is closer
to the char than to the pointer.
char * const is a const pointer to a char, because the const is closer
to the pointer than to the char.
Anyway, never used char const *, which will conflict with my
explanation :)
Best,
Andrey
I stand corrected, char const * is the same as const char* [1], so any
of them would
work for the ini struct.
The C++ FAQ Lite recommends reading it right to left [2], but then the
leftmost const
case is left undefined by the mnemonic, so it isn't valid for all cases,
either.
I'm also attaching a small program showing the different ways of
accessing each of those
and the expected warnings so that your favorite compiler can yell at you :)
[1] http://www.parashift.com/c++-faq/const-correctness.html#faq-18.9
[2] http://www.parashift.com/c++-faq/const-correctness.html#faq-18.5
int main() {
const char* char_const1 = "ABC";
char_const1[0] = 'B'; /* Error */
char_const1 = "DEF"; /* Ok */
char const* char_const2 = "ABC";
char_const2[0] = 'B'; /* Error */
char_const2 = "DEF"; /* Ok */
char * const ptr_const = "ABC";
ptr_const[0] = 'B'; /* Ok */
ptr_const = "DEF"; /* Error */
char const * const const_const = "ABC";
const_const[0] = 'B'; /* Error */
const_const = "DEF"; /* Error */
return 0;
}
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