initializer list in Clang

Question

Today Apple updates Command Line Tools for Xcode and then upgrades clang from 318.0.58 to 318.0.61.

I've tried to use initializer list, but can't compile below code.

#include <iostream> #include <random> #include <initializer_list> int main() { std::mt19937 rng(time(NULL)); std::initializer_list<double> probabilities = { 0.5, 0.1, 0.1, 0.1, 0.1, 0.1 }; std::discrete_distribution<> cheat_dice (probabilities); int a[6] = { }; for ( int i = 0 ; i != 1000; ++i ) { ++a[cheat_dice(rng)]; } for ( int i = 0; i != 6; ++i ) { std::cout << i + 1 << "=" << a[i] << std::endl; } }

Then, I tried to compile.

$ clang++ -stdlib=libc++ foo.cpp

Error log

foo.cpp:9:10: error: no member named 'initializer_list' in namespace 'std' std::initializer_list<double> probabilities = ~~~~~^ foo.cpp:9:33: error: expected '(' for function-style cast or type construction std::initializer_list<double> probabilities = ~~~~~~^ foo.cpp:9:35: error: use of undeclared identifier 'probabilities' std::initializer_list<double> probabilities = ^ foo.cpp:10:5: error: expected expression { ^ foo.cpp:14:46: error: use of undeclared identifier 'probabilities' std::discrete_distribution<> cheat_dice (probabilities); ^ 5 errors generated.

On the other hand, I can compile above code with gcc-4.7.1-RC-20120606.

$ g++ -std=c++11 foo.cpp

Doesn't Apple's clang support initializer list? Clang version:

$ clang++ -v Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn) Target: x86_64-apple-darwin11.4.0 Thread model: posix

dirkgently · Accepted Answer · 2012-06-12 06:16:42Z

15

Try by specifying -std=c++0x (as @jweyrich correctly pointed out) as part of the clang command line. The default for clang is C++98 mode. Initializer lists are a C++11 feature.

Also, from the clang C++98 and C++11 support page you can check the status of various new C++ standard features. For example, initializer lists are available in 3.1 (and above).

edited Jun 12, 2012 at 6:16

answered Jun 12, 2012 at 6:04

dirkgently

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8 Comments

user1214292 Over a year ago

Apple's clang can't recognize -std=c++11

jweyrich Over a year ago

@user1214292: It recognizes -std=c++0x though.

user1214292 Over a year ago

@jweyrich But the result will be unchanged :(

jweyrich Over a year ago

@user1214292: as mentioned in the current answer, the Clang version (3.0) shipped by Apple does not support initializer lists.

user1214292 Over a year ago

@jweyrich $ clang++ -v Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn) Target: x86_64-apple-darwin11.4.0 Thread model: posix

|

A.L. · Accepted Answer · 2012-10-21 13:01:52Z

Compile using the command:

clang++ -stdlib=libc++ -std=c++0x foo.cpp

Note that -std=c++11 also works. In my machine, running:

$ clang --version

results in:

Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn) Target: x86_64-apple-darwin12.2.0

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