error: expected unqualified-id before ‘)’ when I compile a c++ project

Question

I'm having this error when trying to compile a cpp hook project

/root/lib-173/hook.cpp:14:77: error: expected constructor, destructor, or type conversion before ‘(’ token
 rcmp::hook_function<0x0809472A, int(gplayer_imp*, int, const void*, size_t)>([](auto original, gplayer_imp* self, int cmd_type, const void* buf, size_t size) {
                                                                             ^
/root/lib-173/hook.cpp:23:2: error: expected unqualified-id before ‘)’ token
 });

I'm using the project: https://github.com/Smertig/rcmp to hook a function, but when compiling I receive the error presented

my hook.cpp file :

#define CATCH_CONFIG_MAIN
#include "catch2/catch.hpp"

#include <rcmp.hpp>

#include <array>
 

struct gplayer_imp; 




rcmp::hook_function<0x0809472A, int(gplayer_imp*, int, const void*, size_t)>([](auto original, gplayer_imp* self, int cmd_type, const void* buf, size_t size) {
  
  if (cmd_type == 174 && size < 6) {
    
    return 0;
  }

 
  return original(self, cmd_type, buf, size);
});

my CMakeLists.txt :

cmake_minimum_required(VERSION 3.16)
project(hook)


set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR x86_64)


set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)


set(SOURCE_FILES hook.cpp)


add_library(hook SHARED ${SOURCE_FILES})


target_compile_options(hook PRIVATE -std=c++17)


add_subdirectory(/root/lib-173/rcmp)


include_directories(/root/lib-173/rcmp/include)


target_link_libraries(hook PRIVATE rcmp)

Unfortunately, all changes were failures, since depending on the code, rcmp does not accept the new standard. I tried adding other headers or modifying CMakeLists.txt but I was unsuccessful.

What should be done to fix it?

If I already have the answer I haven't found it.

Thanks a lot for the help