support cmake package config file : find_package support + auto-install

[daminetreg]

Dear @nlohmann,

I wish to submit you these changes which adds the possibility for dependent programs of your library to use it easily via cmake find_package, and therefore auto-download+install via hunter_add_package ( i.e. see example cmake )..

HunterGate(
    URL "https://github.com/ruslo/hunter/archive/vUPCOMING.tar.gz"
    SHA1 "53b198e364dc7bc8360fc545f798563229bd7e20"
)

project(dowload-nlohmann-json)

hunter_add_package(nlohmann-json)
find_package(nlohmann-json)

add_executable(main main.cpp)

target_link_libraries(main
  nlohmann-json::nlohmann-json)

For the moment this is not in Hunter ( i.e. See PR #239 ), but even if it isn't accepted in Hunter, it is useful for code depending on your library, as the changes aren't Hunter specific, they allow the standard cmake find_package mechanism to be used to find your library.

Thank you very much for your awesome library to handle json. I like it. 😄
Cheers,

[daminetreg]

Is there any chances that this get merged ? 😄

[nlohmann]

Hi Damien,

I'll check on the weekend.

Cheers,
Niels

Von meinem iPhone gesendet

Am 01.10.2015 um 15:21 schrieb Damien Buhl notifications@github.com:

Is there any chances that this get merged ?

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[daminetreg]

Is there anything I can do to help this get merged ?

[nlohmann]

Sorry for not answering... I'm on holiday right now. I'll check when I come back.

[daminetreg]

No problem 😄 I just wanted to notify that I can change anything/everything if you want/need it. I saw there is a test run error on AppVeyor but I cannot explain it. Is it because I need to link to a different libc++ or so ?

[nlohmann]

Please update the PR so the tests on AppVeyor succeed.