Build issues when using message_filter: placeholder "_1" was not declared in this scope

[chaoli2]

I encounter some build issues. Below is my code and log. What is the error that I made? Thanks.

message_filters::Subscriber<sensor_msgs::msg::Image> camSub(node.get(), "/camera/color/image_raw");
message_filters::Subscriber<object_msgs::msg::Objects> objSub(node.get(), "/movidius_ncs_stream/classified_objects");
message_filters::TimeSynchronizer<sensor_msgs::msg::Image, object_msgs::msg::Objects> sync(camSub, objSub, 10);
sync.registerCallback(std::bind(&showImage, _1, _2)); 

[chaoli2]

I google this problem and follow the suggestion that replace "_1" with "std::placeholders::_1", and then got another issue from message_fiters:

[LLB8]

HI,

Did you solve your problem ?

[chaoli2]

@LLB8
I got another piece of example code from maintainer to help me work around this issue. I suggest maintainer update README to avoid same issues @gaoethan

[tzven0]

Hello,
can someone please tell me how to fix this issue?
Thx in advance!

[spam-12345]

I have the same problem...

[wl3207601]

I have the same problem...