Ambiguity in operator []

Thread Tools Search this Thread
Top Forums Programming Ambiguity in operator []
# 1  
Old 06-13-2011
Ambiguity in operator []

Hi All,

When i try to compile the following code for 64-bit it works, whereas for 32-bit version, Compiler barfs:

#include <iostream>
#include <string>

class String {
    String() { }
    String(const char* src) : myStr(src) { }
    String(const std::string& src) : myStr(src) { }
    String(const String& src) : myStr(src.myStr) { }

    operator const char*() const         { return myStr.c_str(); }
    char& operator[](size_t index)       { return myStr[index]; }
    char operator[] (size_t index) const { return myStr[index]; }

    size_t length() const { return myStr.length(); }
    std::string myStr;

int main() {
    String s("abcd");

    char c = s[1];

    std::cout << c << std::endl;

    return 0;

$ g++ -m32 -Wall -g In function ‘int main()’: error: ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second: note: candidate 1: char& String::operator[](size_t) note: candidate 2: operator[](const char*, int) <built-in>

$ g++ -Wall -g

1) I cannot modify all the instances like, c = s[1]. There are hundreds of similar things in code.
2) operator const char* is required.

Could someone suggest any work-around, considering the above 2 points.


---------- Post updated at 08:39 AM ---------- Previous update was at 08:38 AM ----------

Hi All,

Overloading the operator[], for all integer types (unsigned/signed) (int; long; long long) solved the problem.

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

Difference in multiple inheritance and multilevel inheritance: same method name ambiguity problem

Hi, In multi-level inheritance: class A { public: void fun() { cout << "A" << endl; } }; class B : public A { public: void fun() { cout << "A" << endl; } }; class C : public B { }; int main() { C c;; // Ans: A } (1 Reply)
Discussion started by: royalibrahim
1 Replies

2. UNIX for Dummies Questions & Answers

+= operator

im new to bash scripting and im just using online tutorials and trial and error. i wanted to write a script to read numbers from a file and find their sum: #!/bin/bash theSum=0 for line in $(cat numbers.txt) do let "theSum = theSum + $line" echo "$line" done echo "The sum is... (3 Replies)
Discussion started by: astrolux444
3 Replies

3. Shell Programming and Scripting

equal to operator

Hi, I have the below script executed arg="dir" if "$arg" = "dir" then echo "true" else echo "false" fi Please let me know what happens in the if command. My output is: dir: dir: No such file or directory false which is not the desired output. When i used test command... (1 Reply)
Discussion started by: anijan
1 Replies

4. UNIX for Dummies Questions & Answers

su with << operator

All, THe below is my script , when i use this i am getting nothing . could any one help me to know what is the use of the << operator below su - $8 << supo echo "exportsph $2 $1 $3 $4" exportsph $2 $1 $3 $4 supo i also tried as individual command su - userid << supo , when i do... (3 Replies)
Discussion started by: arunkumar_mca
3 Replies

5. Shell Programming and Scripting

Ambiguity in unicode, Perl CGI

Hello, I was written a cgi with a textarea to save some words from web. I grab and write words like this: $cgiparams{'CONTENTS'} =~ s/\r//g; #$cgiparams{'CONTENTS'} =~ s//&aacute;/g; open(TM, ">$editedfilename"); #binmode(TM,... (1 Reply)
Discussion started by: Zaxon
1 Replies

6. Programming

new operator

Hi, Please clear the 2 questions, 2 Questions, 1) Why the new as a operator? Is there any special reason why it can't be a function like malloc? 2) How are we considering sizeof(),new are as a opearartors? I know + - * / -> , . etc.. are operators, which criteria satisfied by sizeof()... (4 Replies)
Discussion started by: Nagapandi
4 Replies

7. AIX

Fs space ambiguity

Hi All, I found a strange thing in one of our DB server. one of the file system /orcale/ABC/rman size df output showing 100% full eventhough its occupying 2.18MB $ df -mP /oraclev/ABC/rman Filesystem MB blocks Used Available Capacity Mounted on /dev/lv20906 1024.00 1024.00 0.00 100%... (2 Replies)
Discussion started by: ram1729
2 Replies

8. Programming

ambiguity in program output

1 #include <fcntl.h> 2 3 main(int argc, char *argv) 4 { 5 char buf; 6 int fd, count = 0; 7 8 if (argc > 1) 9 fd = open(argv, O_RDONLY); 10 else 11 fd = 0; /* Use standard input */ 12 13 while (read(fd, buf, 1) > 0) { 14 if (count < 5) write(1, buf, 1); 15 ... (3 Replies)
Discussion started by: bishweshwar
3 Replies

9. HP-UX

Or operator with if

hi, i was trying to club to test condition with if. if -o ; then it is giving me error message, i wanted to ask how can we check two condtions with one if. (1 Reply)
Discussion started by: babom
1 Replies

10. Shell Programming and Scripting

And operator

I am trying to check two variables and if both are blank I want to set a flag: the_f3_pid=`rsh $target ps -ef | grep "f3.eab" | awk '{print $2}'` the_f7_pid=`rsh $target ps -ef | grep "f7.eab" | awk '{print $2}'` if ; then y=1 fi I get an error: ./script_name: test: 0403-021 ]... (4 Replies)
Discussion started by: rcarnesiii
4 Replies
Login or Register to Ask a Question