mqtt_cpp
mqtt_cpp copied to clipboard
redboltz
Compile Error In visual studio 2017
as document said "It requires C++14 and the Boost Libraries 1.67.0 or later.", but when comiple in VS （with boost1.68+cpp14）, I get serveal errors. boost_1_68_0\boost\variant\detail\make_variant_list.hpp(40): error C2977: “boost::mpl::list”: boost_1_68_0\boost\variant\detail\make_variant_list.hpp(40): error C2955: “boost::mpl::list”:
Only when I define MQTT_STD_VARIANT with cpp17, I can compile sucess.
On clang++ (13.0.1) -std=c++14, Boost 1.78.0, MQTT_STD_VARIANT=OFF cmake option (MQTT_STD_VARIANT preprocessor macro is not defined), no errors are reported.
C2977 means too many template arguments.
https://github.com/redboltz/mqtt_cpp/blob/f1ebfbfc111bd99b1f131e5f28f7c2b9067947c5/include/mqtt/config.hpp#L12-L29
mqtt_cpp set to the limit list size to 40 if it is not defined.
Those information might help you to analyze the problem.
Perhaps, insert
#include <mqtt/variant.hpp>
into the top of your source code (cpp file) might solve the error.
If it is solved please let me know the current include information.
another puzzle, what's the difference mqtt_cpp-12.0.0 and mqtt_cpp-master? seems code is not absolutly the same
Yes, It works. ths a little weird...
Oh really, I need your source code (mqtt_cpp include part) to fix the issue. So far, I only know the error code. I cant't fix it.
Maybe https://github.com/redboltz/mqtt_cpp/blob/f1ebfbfc111bd99b1f131e5f28f7c2b9067947c5/include/mqtt/client.hpp#L10 https://github.com/redboltz/mqtt_cpp/blob/f1ebfbfc111bd99b1f131e5f28f7c2b9067947c5/include/mqtt_client_cpp.hpp#L7 are related.
another puzzle, what's the difference mqtt_cpp-12.0.0 and mqtt_cpp-master? seems code is not absolutly the same
You can compare by yourself https://github.com/redboltz/mqtt_cpp/compare/v12.0.0...master
Ok, ths. I try to compile the same code in Linux OS with vscode, but get a lot of errors, any tips?
mqtt/will.hpp:47:23: error：enclosing class of constexpr non-static member function ‘mqtt::buffer& mqtt::will::topic()’ is not a literal type constexpr buffer& topic() { ^ mqtt/will.hpp:50:29: error：enclosing class of constexpr non-static member function ‘const mqtt::buffer& mqtt::will::message() const’ is not a literal type constexpr buffer const& message() const { ^ mqtt/will.hpp:53:23: error：enclosing class of constexpr non-static member function ‘mqtt::buffer& mqtt::will::message()’ is not a literal type constexpr buffer& message() { ^ mqtt/will.hpp:56:22: error：enclosing class of constexpr non-static member function ‘mqtt::retain mqtt::will::get_retain() const’ is not a literal type constexpr retain get_retain() const { ^ mqtt/will.hpp:59:19: error：enclosing class of constexpr non-static member function ‘mqtt::qos mqtt::will::get_qos() const’ is not a literal type constexpr qos get_qos() const { ^ mqtt/will.hpp:62:37: error：enclosing class of constexpr non-static member function ‘const properties& mqtt::will::props() const’ is not a literal type constexpr v5::properties const& props() const { ^ mqtt/will.hpp:65:31: error：enclosing class of constexpr non-static member function ‘mqtt::v5::properties& mqtt::will::props()’ is not a literal type constexpr v5::properties& props() {