在Ruby中相当于PERL Carp-＆gt; cluck（$ msg）

Question

Perl有一个名为Carp的模块，可以用来打印消息（w.o explcitly引发异常），打印消息和完整的堆栈跟踪。 即。

use Carp qw(cluck) ;
cluck ("foo")

会屈服：

foo called from file bar, line 2

如何在Ruby中获得类似的东西？

Answer 1

您可以Kernel#caller_locations使用此http://www.ruby-doc.org/core-2.0.0/Kernel.html#method-i-caller_locations）

def cluck(val)
  loc = caller_locations.last
  puts "#{val} called from file #{loc.path}, line #{loc.lineno}"
end

cluck 1
cluck "hello"

输出：

1 called from file line_of_caller.rb, line 6
hello called from file line_of_caller.rb, line 7

loc这里是Thread :: Backtrace :: Location的一个实例，所以你也可以从中获取更多信息;看看http://www.ruby-doc.org/core-2.0.0/Thread/Backtrace/Location.html