#include <boost/range/adaptors.hpp>
#include <boost/assign.hpp>
#include <iostream>
using namespace boost::adaptors;
using namespace boost::assign;
template<int N>
struct factorial
{
enum {
value = N * factorial<N-1>::value
};
};
template<>
struct factorial<0>
{
enum {
value = 1
};
};
int main()
{
typedef std::map<uint64_t, std::string> map_type;
map_type const map_obj = {
{ 0x0000000000000401, "one" },
{ 0x0000000000000002, "two" },
{ 0x0000000000000003, "three" },
{ 0x0000000000000404, "four" },
{ 0x0000000000000005, "five" },
};
const int mask_value = 0x000000000000FF00;
auto func = [](const map_type::value_type& p)
{
std::cout << " value_type.second: " << p.second << "\n";
return (p.first & mask_value) != 0;
};
for(const auto&v : map_obj | filtered(func) | map_values)
{
std::cout << " Got: " << v <<"\n" ;
}
std::cout << " 5!: " << factorial<5>::value << "\n";
}
上面的示例代码用于在Xcode中编译,但在Xcode 6.3中,它无法在main函数的开头编译map obj的初始化列表。升级头没有抱怨。任何想法,为什么?
答案 0 :(得分:0)
哦,错误是链接时间错误,我的提升是使用libc ++而不是使用libstdc ++构建的。切换库有效。