This question already has answers here:
about "int const *p" and "const int *p "
(9 answers)
What is the difference between const int*, const int * const, and int const *?
(23 answers)
Closed 9 years ago.
void func1 (const int *);
void func2 (int const *);
void func3 (int * const);
Which two signatures are equivalent? If none of them are, can you please explain the subtle differences?
The first two are equivalent (the int is const), in the third it's the pointer that's const (i.e. the parameter itself).
Related
This question already has answers here:
What does `const T* const` mean?
(8 answers)
What is the difference between const int*, const int * const, and int const *?
(23 answers)
Closed 11 months ago.
I think that this means that you have a constant that has a constant address, but I am not sure what this means and want to check.
This question already has answers here:
Difference between char* var; and char *var;? [duplicate]
(1 answer)
Placement of the asterisk in pointer declarations
(14 answers)
Closed 5 years ago.
class str
{
char *p;
public:
string(const char *s);
}
I am confused about the difference between these two declarations.
const char * is a pointer to a const char, you cant change the value being pointed to, but you can change the pointer
char * const is a constant pointer to a char, [behaving like a reference type] you can change the value pointed to but you cant change the pointer.
const char * const is a constant pointer to a constant char, [both are constants]
This question already has answers here:
What is the difference between const int*, const int * const, and int const *?
(23 answers)
Closed 7 years ago.
I understand that the const keyword means that you can't change a variable's value so what does it mean if it used like this :
const char* const& message
The first const stays for the pointer reference itself cannot be changed, so you cannot do something like:
message = &something;
the second const is for the content of the pointer, so you cannot do something like:
*message = something;
This question already has answers here:
What is the difference between const int*, const int * const, and int const *?
(23 answers)
constant pointer vs pointer on a constant value [duplicate]
(11 answers)
Closed 8 years ago.
For a given type T:
What is the difference between const T * and T * const?
Also, are there other places that const can go? For instance, is T const * a thing? Can you have more than one const in an expression, such as const T * const?
const T *x means x points to an object of type T, but that object should not be modified.
On the other hand, T *const x means the pointer itself cannot be modified (but the object it points to can).
const T *const x is just a combination of the two; both the pointer and the object it points to cannot be modified.
This question already has answers here:
What is the difference between const int*, const int * const, and int const *?
(23 answers)
Difference between const char* p and char const* p [duplicate]
(5 answers)
Closed 8 years ago.
This might have been asked and might be a silly question, but what is the difference between these:
void f(int const& par);
void f(const int& par);
There is no difference, const is applied to the left unless it comes first, then it applies to the right.