今天Apple更新Xcode的命令行工具,然后将318.0.58的clang升级到318.0.61。Clang中的初始化程序列表
我试过使用初始化列表,但不能编译下面的代码。
#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;
}
}
然后,我试着编译。
错误日志
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.
在另一方面,我可以编译上述代码用gcc-4.7.1-RC-20120606。
$ g++ -std=c++11 foo.cpp
Apple不支持初始化程序列表吗? 锵版本:
$ 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
苹果铛不能识别'-std = C++ 11' – user1214292
@ user1214292:它承认'-std = C++ 0x'虽然。 – jweyrich
@jweyrich但结果将保持不变:( – user1214292