mongocxx document steam 使用 time_t 转的 long long，在 mac 下可以编译运行，在 docker 的 ubuntu 里报错

@gnaggnoyil #1 不好意思，之前发帖的时候太匆忙了没有表述到位。大致可以总结成下面这种情况，只要用了time_t转成的long long就不行（在ubuntu环境下）

time_t now = time(0); auto cOnfig= bsoncxx::builder::stream::document{} << "last_studied@" << (long long)(now) // 第47行 << bsoncxx::builder::stream::finalize; 

但是下面这种情况就没有编译报错

auto cOnfig= bsoncxx::builder::stream::document{} << "last_studied@" << (long long)(946684800) << bsoncxx::buildr::stream::finalize; 

具体的编译错误如下（可以确定都是同样内容的编译错误，除了对应的行数不同）：

g++ -c -std=c++11 -g jobPool.cpp -I/usr/local/include/mongocxx/v_noabi -I/usr/local/include/libmongoc-1.0 -I/usr/local/include/bsoncxx/v_noabi -I/usr/local/include/libbson-1.0 In file included from /usr/local/include/bsoncxx/v_noabi/bsoncxx/builder/stream/key_context.hpp:20:0, from /usr/local/include/bsoncxx/v_noabi/bsoncxx/builder/stream/document.hpp:18, from jobPool.h:15, from jobPool.cpp:4: /usr/local/include/bsoncxx/v_noabi/bsoncxx/builder/stream/value_context.hpp: In instantiation of 'typename std::enable_if<(! std::is_convertible<T, std::function<void(bsoncxx::v_noabi::builder::stream::single_context)> >::value), base>::type bsoncxx::v_noabi::builder::stream::value_context<base>::operator<<(T&&) [with T = long long int; base = bsoncxx::v_noabi::builder::stream::key_context<>; typename std::enable_if<(! std::is_convertible<T, std::function<void(bsoncxx::v_noabi::builder::stream::single_context)> >::value), base>::type = bsoncxx::v_noabi::builder::stream::key_context<>]': jobPool.cpp:47:58: required from here /usr/local/include/bsoncxx/v_noabi/bsoncxx/builder/stream/value_context.hpp:70:9: error: call of overloaded 'append(long long int)' is ambiguous _core->append(std::forward<T>(t));