constructors and references

[copx]

This compiles:

struct FileWriterI; struct FileWriter {
FileWriterI& self;
FileWriter(FileWriterI& i) : self(i) {}
}

This does not:

struct FileWriterI; struct FileWriter {
FileWriterI& self;
FileWriter(FileWriterI& i) : self{i} {}
}

Why? Why can't I initialize references using {} in constructors? I use
GCC 4.7.0, c++11 mode.

 

[Victor Bazarov]

This compiles:

struct FileWriterI; struct FileWriter {
FileWriterI& self;
FileWriter(FileWriterI& i) : self(i) {}
}

This does not:

struct FileWriterI; struct FileWriter {
FileWriterI& self;
FileWriter(FileWriterI& i) : self{i} {}
}

Why? Why can't I initialize references using {} in constructors? I use
GCC 4.7.0, c++11 mode.

Maybe because the braces aren't part of the C++ syntax for the member
initializers... Just a wild guess... Brackets won't work, either. Nor
will angle brackets... Only parentheses.

V

 

[copx]

Maybe because the braces aren't part of the C++ syntax for the member
initializers... Just a wild guess...

You guessed wrong:
http://en.wikipedia.org/wiki/C++11#Uniform_initialization

...and my compiler accepts such initialization with -std=c++11 -Wall
-Wextra -pedantic for all types.. except references. The question
remains: why?!

As I said, all other types are fine, including pointers!

 

[copx]

This compiles:

struct FileWriterI; struct FileWriter {
FileWriterI& self;
FileWriter(FileWriterI& i) : self(i) {}
}

This does not:

struct FileWriterI; struct FileWriter {
FileWriterI& self;
FileWriter(FileWriterI& i) : self{i} {}
}

Why? Why can't I initialize references using {} in constructors? I use
GCC 4.7.0, c++11 mode.

Finally found the answer:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50025

It's a bug in the C++11 standard itself!