Checking if your kit is complete...
Looks good
Writing Makefile for c_plus_plus

Microsoft (R) Program Maintenance Utility   Version 6.00.8168.0
Copyright (C) Microsoft Corp 1988-1998. All rights reserved.

Math::BigInt: couldn't load specified math lib(s), fallback to Math::BigInt::FastCalc at C:/cpanrun/build/5-10-0/site/lib/Win32API/File.pm line 20
cp c_plus_plus.pm blib\lib\c_plus_plus.pm
	C:\cpanrun\build\5-10-0\bin\perl.exe C:\cpanrun\build\5-10-0\lib\ExtUtils\xsubpp  -typemap C:\cpanrun\build\5-10-0\lib\ExtUtils\typemap  c_plus_plus.xs > c_plus_plus.xsc && C:\cpanrun\build\5-10-0\bin\perl.exe -MExtUtils::Command -e mv c_plus_plus.xsc c_plus_plus.c
Please specify prototyping behavior for c_plus_plus.xs (see perlxs manual)
	cl -c  -x c++  -nologo -GF -W3 -MD -Zi -DNDEBUG -O1 -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DUSE_SITECUSTOMIZE -DPRIVLIB_LAST_IN_INC -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSVCRT_READFIX -MD -Zi -DNDEBUG -O1    -DVERSION=\"0.1\"  -DXS_VERSION=\"0.1\"  "-IC:\cpanrun\build\5-10-0\lib\CORE"   c_plus_plus.c
Command line warning D4002 : ignoring unknown option '-x'
Command line warning D4024 : unrecognized source file type 'c++', object file assumed
Command line warning D4027 : source file 'c++' ignored
c_plus_plus.c
c_plus_plus.xs(11) : error C2061: syntax error : identifier 'aaa'
c_plus_plus.xs(11) : error C2059: syntax error : ';'
c_plus_plus.xs(11) : error C2449: found '{' at file scope (missing function header?)
c_plus_plus.xs(17) : error C2059: syntax error : '}'
c_plus_plus.xs(25) : error C2065: 'a' : undeclared identifier
c_plus_plus.xs(25) : error C2224: left of '.message' must have struct/union type
c_plus_plus.xs(26) : error C2065: 'aaa' : undeclared identifier
c_plus_plus.xs(26) : error C2146: syntax error : missing ';' before identifier 'b'
c_plus_plus.xs(26) : warning C4013: 'b' undefined; assuming extern returning int
c_plus_plus.xs(27) : error C2224: left of '.message' must have struct/union type
NMAKE : fatal error U1077: 'cl' : return code '0x2'
Stop.