在 C++ 中创建一个erase() function 的自制副本

Question

I am trying to create a function to do what the built-in function .erase() does in c++ with the following code:

string delChar(string text, int no_of_ch_to_delete, int starting_point)
{
    int Final_Point = starting_point + no_of_ch_to_delete;
    for (int i = starting_point; i <= Final_Point; i++)
    {
        text = text.at(i) = '\0';
    }
    return text;
}

This is giving me an error that I am unable to figure out:

Unhandled exception thrown: write access violation.
std::basic_string<char,std::char_traits<char>,std::allocator<char> >::at(...) returned 0xCD9CC6C4.

How can I correct this?

Answer 1

This line:

text = text.at(i) = '\0';

is effectively the same as

text.at(i) = '\0';
text = '\0';

The last line replaces any contents of the string text with the single character \0 . text has now 1 element and any further access via at(i) is out-of-bounds.