$ make clang++ -o liblibrary.so library.cpp library-bridge.cpp \ -std=c++17 -O3 -Wall -Wextra -fPIC -shared $ go run library.go [c++ bridge] LIB_NewFoo(42) [c++] Foo::Foo(42) [c++ bridge] LIB_NewFoo(42) will return pointer 0x42002e0 [c++ bridge] LIB_FooValue(0x42002e0) [c++] Foo::value() is 42 [go] 42 [c++ bridge] LIB_DestroyFoo(0x42002e0) [c++] Foo::~Foo(42) 

$ go build library.go $ ./library [c++ bridge] LIB_NewFoo(42) [c++] Foo::Foo(42) [c++ bridge] LIB_NewFoo(42) will return pointer 0x4500000 [c++ bridge] LIB_FooValue(0x4500000) [c++] Foo::value() is 42 [go] 42 [c++ bridge] LIB_DestroyFoo(0x4500000) [c++] Foo::~Foo(42) 

$ cd goroutines $ make fancy clang++ -o libfancy.so fancy.cpp \ -std=c++17 -O3 -Wall -Wextra -fPIC -shared go build fancy.go $ ./fancy [go] dispatched all tasks [go] dispatching io_intensive [go] dispatching cpu_intensive( 45 ) [go] dispatching cpu_intensive( 30 ) [c++] starting to download NASA image on thread 0x7fff94f7d340. [c++] starting fib(45) on thread 0x7000006a0000. [go] dispatching cpu_intensive( 45 ) [c++] starting fib(30) on thread 0x70000061d000. [go] dispatching cpu_intensive( 40 ) [c++] starting fib(45) on thread 0x70000059a000. [c++] starting fib(40) on thread 0x7000008ac000. [go] dispatching cpu_intensive( 35 ) [c++] starting fib(35) on thread 0x7000007a6000. [go] dispatching cpu_intensive( 35 ) [go] dispatching cpu_intensive( 30 ) [c++] starting fib(35) on thread 0x7000009b2000. [c++] starting fib(30) on thread 0x700000829000. [go] dispatching cpu_intensive( 30 ) [c++] starting fib(30) on thread 0x700000a35000. [c++] fib(30) on thread 0x700000829000 took 0.003607 seconds. [go] dispatching cpu_intensive( 45 ) [go] dispatching cpu_intensive( 45 ) [c++] fib(30) on thread 0x70000061d000 took 0.003796 seconds. [go] dispatching cpu_intensive( 40 ) [c++] starting fib(45) on thread 0x700000829000. [go] dispatching cpu_intensive( 40 ) [c++] fib(30) on thread 0x700000a35000 took 0.003653 seconds. [go] dispatching cpu_intensive( 50 ) [c++] starting fib(45) on thread 0x700000ab8000. [c++] starting fib(40) on thread 0x70000061d000. [c++] starting fib(40) on thread 0x70000092f000. [c++] starting fib(50) on thread 0x700000a35000. [go] dispatching cpu_intensive( 45 ) [c++] starting fib(45) on thread 0x700000b3b000. [go] dispatching io_intensive [c++] starting to download NASA image on thread 0x700000bbe000. [go] dispatching cpu_intensive( 50 ) [c++] starting fib(50) on thread 0x700000c41000. [go] dispatching cpu_intensive( 35 ) [c++] starting fib(35) on thread 0x700000cc4000. [go] dispatching io_intensive [c++] starting to download NASA image on thread 0x700000d47000. [c++] fib(35) on thread 0x7000009b2000 took 0.063846 seconds. [go] dispatching cpu_intensive( 50 ) [c++] starting fib(50) on thread 0x7000009b2000. [c++] fib(35) on thread 0x7000007a6000 took 0.067398 seconds. [go] dispatching cpu_intensive( 45 ) [c++] starting fib(45) on thread 0x7000007a6000. [c++] fib(35) on thread 0x700000cc4000 took 0.054202 seconds. [c++] fib(40) on thread 0x70000061d000 took 0.707855 seconds. [c++] fib(40) on thread 0x7000008ac000 took 0.716816 seconds. [c++] fib(40) on thread 0x70000092f000 took 0.716797 seconds. [c++] fib(45) on thread 0x70000059a000 took 6.23767 seconds. [c++] fib(45) on thread 0x700000829000 took 6.23499 seconds. [c++] fib(45) on thread 0x7000006a0000 took 6.23971 seconds. [c++] fib(45) on thread 0x700000ab8000 took 6.2396 seconds. [c++] fib(45) on thread 0x700000b3b000 took 6.23648 seconds. [c++] fib(45) on thread 0x7000007a6000 took 6.1945 seconds. [c++] downloaded NASA image [c++] io_intensive on thread 0x7fff94f7d340 took 12.1647 seconds. [c++] downloaded NASA image [c++] io_intensive on thread 0x700000bbe000 took 23.5905 seconds. [c++] downloaded NASA image [c++] io_intensive on thread 0x700000d47000 took 32.3157 seconds. [c++] fib(50) on thread 0x700000a35000 took 33.1472 seconds. [c++] fib(50) on thread 0x700000c41000 took 33.1787 seconds. [c++] fib(50) on thread 0x7000009b2000 took 33.2035 seconds. [go] done (elapsed: 33.268694231 seconds)