how to catch exception modifications to the array "const pointer"

[zsukal]

Hello.
I write function whose Modifying array (char), how to check that variable of function is non-const.

implementation

void modifying(char* arr){
 // how to check that [arr] is dynamical or const 
// or how to throw exception bellow not help
/*	try {
		arr[0] = 'a';
	} catch(...) {
		throw;
	}*/

 arr[0] = 'a';
}

using in main

char* arr1 = new char[2];
arr1[1] = '\0';
arr1[0] = 'b';
modifying(arr); // ok

char* arr2 = "ddd";
modifying(arr2); //error 

[Peter87]

To store a pointer to a string literal you should use a pointer to a const.
const char* arr2 = "ddd";
Now you will get a compiler error when you try to call modifying(arr2);

char* arr2 = "ddd"; This was deprecated in C++03 and is no longer valid code in C++11. If you turn up you compiler's warning level you should be able to get a warning when you try to do this.

[therockon7throw]

Hi

First you define the parameter of the function to be const or not.

// this function can only read the arr, but cant modify it
void cantModify(const char* arr){

}

// this function can modify the arr
void canModify(char* arr){

}

Second you have problem in your main line 6! you assign some characters to your arr2 which was not allocared!

hope it helps