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What does this compiler error means - “qualified-id in declaration before ‘=’ token” in C++?

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0

I am trying to understand the usage of private const in the class.
My understanding is that private const is used to make something constant within the class and static to have one copy.

Initially, my code was using pi and it's data type was float. So, I tried changing the float to int because I read const static is only allowed for int types within class.

#include <iostream>
class MyExample


 private:
 static const int x;

;

int main(void)

 int const MyExample::x = 3;

 std::cout<<"x value is "<<MyExample::x<<std::endl;

 return 0;

compiling -

$g++ -std=c++14 test.cpp
test.cpp: In function ‘int main()’:
test.cpp:12:27: error: qualified-id in declaration before ‘=’ token
 int const MyExample::x = 3;

I know that moving the line " int const MyExample::x = 3;" from main() to outside, removes error if I remove private also.

c++ c++11 c++14

share|improve this question

edited Mar 25 at 0:36

Prawn Hongs

asked Mar 25 at 0:23

Prawn HongsPrawn Hongs

848

add a comment | 

0

I am trying to understand the usage of private const in the class.
My understanding is that private const is used to make something constant within the class and static to have one copy.

Initially, my code was using pi and it's data type was float. So, I tried changing the float to int because I read const static is only allowed for int types within class.

#include <iostream>
class MyExample


 private:
 static const int x;

;

int main(void)

 int const MyExample::x = 3;

 std::cout<<"x value is "<<MyExample::x<<std::endl;

 return 0;

compiling -

$g++ -std=c++14 test.cpp
test.cpp: In function ‘int main()’:
test.cpp:12:27: error: qualified-id in declaration before ‘=’ token
 int const MyExample::x = 3;

I know that moving the line " int const MyExample::x = 3;" from main() to outside, removes error if I remove private also.

c++ c++11 c++14

share|improve this question

edited Mar 25 at 0:36

Prawn Hongs

asked Mar 25 at 0:23

Prawn HongsPrawn Hongs

848

add a comment | 

I am trying to understand the usage of private const in the class.
My understanding is that private const is used to make something constant within the class and static to have one copy.

Initially, my code was using pi and it's data type was float. So, I tried changing the float to int because I read const static is only allowed for int types within class.

#include <iostream>
class MyExample


 private:
 static const int x;

;

int main(void)

 int const MyExample::x = 3;

 std::cout<<"x value is "<<MyExample::x<<std::endl;

 return 0;

compiling -

$g++ -std=c++14 test.cpp
test.cpp: In function ‘int main()’:
test.cpp:12:27: error: qualified-id in declaration before ‘=’ token
 int const MyExample::x = 3;

I know that moving the line " int const MyExample::x = 3;" from main() to outside, removes error if I remove private also.

c++ c++11 c++14

share|improve this question

edited Mar 25 at 0:36

Prawn Hongs

asked Mar 25 at 0:23

Prawn HongsPrawn Hongs

848

#include <iostream>
class MyExample


 private:
 static const int x;

;

int main(void)

 int const MyExample::x = 3;

 std::cout<<"x value is "<<MyExample::x<<std::endl;

 return 0;

$g++ -std=c++14 test.cpp
test.cpp: In function ‘int main()’:
test.cpp:12:27: error: qualified-id in declaration before ‘=’ token
 int const MyExample::x = 3;

share|improve this question

edited Mar 25 at 0:36

Prawn Hongs

asked Mar 25 at 0:23

Prawn HongsPrawn Hongs

848

share|improve this question

edited Mar 25 at 0:36

Prawn Hongs

asked Mar 25 at 0:23

Prawn HongsPrawn Hongs

848

asked Mar 25 at 0:23

Prawn HongsPrawn Hongs

848

asked Mar 25 at 0:23

Prawn HongsPrawn Hongs

848

2 Answers
2

active

oldest

votes

1

MyExample::x is a qualified-id and you have placed it in a declaration before the = token. This is not allowed at block scope.

share|improve this answer

answered Mar 25 at 1:04

M.MM.M

108k12123249

add a comment | 

0

because the variable ' x' is private access modifier, that means variable x used only in the class. So you can't use that variable in main function.

and there is 2 suggestion.

first, make getter, setter method.

second, change to public access modifier.

thanks

share|improve this answer

answered Mar 25 at 0:44

Seil ChoiSeil Choi

404

add a comment | 

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1

MyExample::x is a qualified-id and you have placed it in a declaration before the = token. This is not allowed at block scope.

share|improve this answer

answered Mar 25 at 1:04

M.MM.M

108k12123249

add a comment | 

1

MyExample::x is a qualified-id and you have placed it in a declaration before the = token. This is not allowed at block scope.

share|improve this answer

answered Mar 25 at 1:04

M.MM.M

108k12123249

add a comment | 

MyExample::x is a qualified-id and you have placed it in a declaration before the = token. This is not allowed at block scope.

share|improve this answer

answered Mar 25 at 1:04

M.MM.M

108k12123249

share|improve this answer

answered Mar 25 at 1:04

M.MM.M

108k12123249

answered Mar 25 at 1:04

M.MM.M

108k12123249

answered Mar 25 at 1:04

M.MM.M

108k12123249

0

because the variable ' x' is private access modifier, that means variable x used only in the class. So you can't use that variable in main function.

and there is 2 suggestion.

first, make getter, setter method.

second, change to public access modifier.

thanks

share|improve this answer

answered Mar 25 at 0:44

Seil ChoiSeil Choi

404

add a comment | 

0

because the variable ' x' is private access modifier, that means variable x used only in the class. So you can't use that variable in main function.

and there is 2 suggestion.

first, make getter, setter method.

second, change to public access modifier.

thanks

share|improve this answer

answered Mar 25 at 0:44

Seil ChoiSeil Choi

404

add a comment | 

because the variable ' x' is private access modifier, that means variable x used only in the class. So you can't use that variable in main function.

and there is 2 suggestion.

first, make getter, setter method.

second, change to public access modifier.

thanks

share|improve this answer

answered Mar 25 at 0:44

Seil ChoiSeil Choi

404

share|improve this answer

answered Mar 25 at 0:44

Seil ChoiSeil Choi

404

answered Mar 25 at 0:44

Seil ChoiSeil Choi

404

answered Mar 25 at 0:44

Seil ChoiSeil Choi

404