Second take to fix the breaking change in boost 1.86

Author: jgaa

include/restc-cpp/restc-cpp.h

@@ -57,6 +57,14 @@
        throw; /* required for Boost Coroutine! */ \
     } catch (...)
 
+#if BOOST_VERSION >= 108100
+// They changed the function signature. In boost 1.86 it broke the build.
+#define RESTC_CPP_SPAWN_TRAILER \
+    , boost::asio::detached
+#else
+#define RESTC_CPP_SPAWN_TRAILER
+#endif
+
 namespace restc_cpp {
 
 class RestClient;
@@ -421,7 +429,7 @@ class RestClient {
                 prom->set_exception(std::current_exception());
             }
             done_handler.reset();
-        }, boost::asio::detached);
+        } RESTC_CPP_SPAWN_TRAILER);
 
         return future;
     }

src/RestClientImpl.cpp

@@ -342,7 +342,7 @@ class  RestClientImpl final : public RestClient {
     void Process(const prc_fn_t& fn) override {
         boost::asio::spawn(*io_service_,
                            bind(&RestClientImpl::ProcessInWorker, this,
-                                placeholders::_1, fn, nullptr), boost::asio::detached);
+                                placeholders::_1, fn, nullptr) RESTC_CPP_SPAWN_TRAILER);
     }
 
     future< void > ProcessWithPromise(const prc_fn_t& fn) override {
@@ -351,7 +351,7 @@ class  RestClientImpl final : public RestClient {
 
         boost::asio::spawn(*io_service_,
                            bind(&RestClientImpl::ProcessInWorker, this,
-                                placeholders::_1, fn, promise), boost::asio::detached);
+                                placeholders::_1, fn, promise) RESTC_CPP_SPAWN_TRAILER);
 
         return future;
     }