我想用lexical_castfloat将float转换为字符串.通常它工作正常,但我有一些没有小数的数字的问题.如何修复字符串中显示的小数?
例:
double n=5;
string number;
number = boost::lexical_cast<string>(n);
Run Code Online (Sandbox Code Playgroud)
结果号码5,我需要号码5.00.
我是ruby的新手,也许这是一个非常简单的问题.我想使用eventmachine为我的测试开发一个模拟器.以下文档中的示例我可以这样写:
require 'eventmachine'
class Server< EM::Connection
def receive_data data
send_data data
close_connection_after_writing
end
end
#Note that this will block current thread.
EventMachine.run {
EventMachine.start_server '127.0.0.1','8080', Server
}
Run Code Online (Sandbox Code Playgroud)
但我想知道是否有办法使用类的实例,如:
require 'eventmachine'
class Server< EM::Connection
attr_accessor :response
def receive_data data
send_data @response
close_connection_after_writing
end
end
server1 = Server.new
server1.response = "foo"
#Note that this will block current thread.
EventMachine.run {
EventMachine.start_server '127.0.0.1','8080', server1
}
Run Code Online (Sandbox Code Playgroud)
我尝试阅读源代码..但对我来说太难了.我肯定错过了一些东西,但我不知道怎么做这样的事情.