src: use unique_ptr for http2_state

[fhinkel]

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

src

[addaleax]

CI: https://ci.nodejs.org/job/node-test-commit/14139/

[addaleax]

https://ci.nodejs.org/job/node-test-commit-linux/nodes=ubuntu1710-x64/14240/console says:

In file included from ../src/inspector_agent.h:13:0,
                 from ../src/env.h:30,
                 from ../src/env-inl.h:28,
                 from ../src/base_object-inl.h:28,
                 from ../src/async_wrap-inl.h:28,
                 from ../src/async_wrap.cc:22:
../src/node_platform.h:81:45: error: ‘function’ is not a member of ‘std’
   typedef std::unique_ptr<DelayedTask, std::function<void(DelayedTask*)>>
                                             ^~~~~~~~
../src/node_platform.h:81:45: note: suggested alternative: ‘is_function’
   typedef std::unique_ptr<DelayedTask, std::function<void(DelayedTask*)>>
                                             ^~~~~~~~
                                             is_function
../src/node_platform.h:81:45: error: ‘function’ is not a member of ‘std’
../src/node_platform.h:81:45: note: suggested alternative: ‘is_function’
   typedef std::unique_ptr<DelayedTask, std::function<void(DelayedTask*)>>
                                             ^~~~~~~~
                                             is_function
../src/node_platform.h:81:72: error: template argument 2 is invalid
   typedef std::unique_ptr<DelayedTask, std::function<void(DelayedTask*)>>
                                                                        ^~
node.target.mk:202: recipe for target '/home/iojs/build/workspace/node-test-commit-linux/nodes/ubuntu1710-x64/out/Release/obj.target/node/src/async_wrap.o' failed

[fhinkel]

Thanks for running the CI and spotting the error. Looks like -std=c++0x is missing. I'll look into it.

[addaleax]

@fhinkel I’d guess it’s just a missing #include?

[addaleax]

New CI: https://ci.nodejs.org/job/node-test-commit/14144/

[addaleax]

Landed in 2d50b5e