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
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).
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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