C++11 overhaul - Fixes #7, fixes #9

[TedLyngmo]

This is meant as a co-op patch to make the library use and require C++11
or later. This is not a backwards compatible patch since it'll fail to
build in C++ versions prior to C++11.

• TODO: Figure out how to make boost use std::iterator instead of its
  own iterator to get rid of the
  BOOST_HEADER_DEPRECATED("<iterator>") warning

[adedov]

Ted,

Thank you! Will process this week.

[adedov]

Can't build with Mac CLang C++:
c++ --version
Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin19.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

[ 80%] Building CXX object tests/CMakeFiles/server-test.dir/test_server.cc.o
/Users/anton-dedov/personal/src/libiqxmlrpc/tests/test_server.cc:58:3: error: constructor for 'CallCountingInterceptor' must explicitly initialize the base class
'iqxmlrpc::Interceptor' which does not have a default constructor
CallCountingInterceptor(): count(0) {}
^
/Users/anton-dedov/personal/src/libiqxmlrpc/libiqxmlrpc/method.h:103:23: note: 'iqxmlrpc::Interceptor' declared here
class LIBIQXMLRPC_API Interceptor {
^
/Users/anton-dedov/personal/src/libiqxmlrpc/tests/test_server.cc:108:3: error: call to constructor of 'std::unique_ptr<Executor_factory_base>' is ambiguous
ef_(0),
^ ~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:2466:13: note: candidate constructor [with _Dummy = true, $1 = void]
constexpr unique_ptr(nullptr_t) noexcept : _ptr(pointer()) {}
^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:2471:12: note: candidate constructor [with _Dummy = true, $1 = void]
explicit unique_ptr(pointer __p) noexcept : _ptr(__p) {}
^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:2494:3: note: candidate constructor
unique_ptr(unique_ptr&& __u) noexcept
^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:2401:28: note: candidate constructor (the implicit copy constructor) has been implicitly deleted
class LIBCPP_TEMPLATE_VIS unique_ptr {
^
/Users/anton-dedov/personal/src/libiqxmlrpc/tests/test_server.cc:109:3: error: call to constructor of 'std::unique_ptr' is ambiguous
impl(0)
^ ~
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:2466:13: note: candidate constructor [with _Dummy = true, $1 = void]
constexpr unique_ptr(nullptr_t) noexcept : _ptr(pointer()) {}
^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:2471:12: note: candidate constructor [with _Dummy = true, $1 = void]
explicit unique_ptr(pointer __p) noexcept : _ptr(__p) {}
^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:2494:3: note: candidate constructor
unique_ptr(unique_ptr&& _u) noexcept
^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:2401:28: note: candidate constructor (the implicit copy constructor) has been implicitly deleted
class LIBCPP_TEMPLATE_VIS unique_ptr {
^
/Users/anton-dedov/personal/src/libiqxmlrpc/tests/test_server.cc:132:31: error: call to implicitly-deleted default constructor of 'LogInterceptor'
impl->push_interceptor(new LogInterceptor);
^
/Users/anton-dedov/personal/src/libiqxmlrpc/tests/test_server.cc:24:23: note: default constructor of 'LogInterceptor' is implicitly deleted because base class
'iqxmlrpc::Interceptor' has no default constructor
class LogInterceptor: public Interceptor {
^
/Users/anton-dedov/personal/src/libiqxmlrpc/tests/test_server.cc:133:31: error: call to implicitly-deleted default constructor of 'TraceInterceptor'
impl->push_interceptor(new TraceInterceptor);
^
/Users/anton-dedov/personal/src/libiqxmlrpc/tests/test_server.cc:33:25: note: default constructor of 'TraceInterceptor' is implicitly deleted because base class
'iqxmlrpc::Interceptor' has no default constructor
class TraceInterceptor: public Interceptor {
^
5 errors generated.
make[2]: *** [tests/CMakeFiles/server-test.dir/test_server.cc.o] Error 1
make[1]: *** [tests/CMakeFiles/server-test.dir/all] Error 2
make: *** [all] Error 2

[TedLyngmo]

Oups - I see I missed building the tests but I fixed it. It now compiles and runs all the tests OK for me.

[TedLyngmo]

I just noticed this old patchset. Was there a problem with it? I hardly remember what made me put it up here. It must have been some code I used 2 years ago that used this library but I don't remember what it was :-)