cocoapods integration

cocoapods/NJSHeaderOnly.mm

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+// We need this file to please cocoapods as cocoapods
+// doesn't support pure C++ libraries. We need mm so
+// cocoapods enables Objective-C++
+
+int NJSHeaderOnly() {
+    return 42;
+}

cocoapods/NSJHeaderOnlyObjc.m

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+// cocoapods is weird we also need this.
+
+int NSJHeaderOnlyObjc() {
+    return 42;
+}

nlohmann_json.podspec

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+#
+#  Be sure to run `pod spec lint nlohmann_json.podspec' to ensure this is a
+#  valid spec and to remove all comments including this before submitting the spec.
+#
+#  To learn more about Podspec attributes see http://docs.cocoapods.org/specification.html
+#  To see working Podspecs in the CocoaPods repo see https://github.com/CocoaPods/Specs/
+#
+
+Pod::Spec.new do |s|
+
+  # ―――  Spec Metadata  ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  These will help people to find your library, and whilst it
+  #  can feel like a chore to fill in it's definitely to your advantage. The
+  #  summary should be tweet-length, and the description more in depth.
+  #
+
+  s.name         = "nlohmann_json"
+  s.version      = "3.1.2"
+  s.summary      = "JSON reader & writer for C++ optimized for ease of use and modern C++14"
+
+  # This description is used to generate tags and improve search results.
+  #   * Think: What does it do? Why did you write it? What is the focus?
+  #   * Try to keep it short, snappy and to the point.
+  #   * Write the description between the DESC delimiters below.
+  #   * Finally, don't worry about the indent, CocoaPods strips it!
+  s.description  = <<-DESC
+    JSON library for c++, it can read & write, uses C++14 features to have
+    modern syntax.
+                   DESC
+
+  s.homepage     = "https://github.com/nlohmann/json"
+  # s.screenshots  = "www.example.com/screenshots_1.gif", "www.example.com/screenshots_2.gif"
+
+
+  # ―――  Spec License  ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  Licensing your code is important. See http://choosealicense.com for more info.
+  #  CocoaPods will detect a license file if there is a named LICENSE*
+  #  Popular ones are 'MIT', 'BSD' and 'Apache License, Version 2.0'.
+  #
+
+  #s.license      = "MIT (example)"
+  license_text = File.read("LICENSE.MIT")
+  # cocoapods checks extension and expects it to be a txt. so instead
+  # we read the file and pass it in as text.
+  s.license      = { :type => "MIT", :text => license_text }
+
+
+  # ――― Author Metadata  ――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  Specify the authors of the library, with email addresses. Email addresses
+  #  of the authors are extracted from the SCM log. E.g. $ git log. CocoaPods also
+  #  accepts just a name if you'd rather not provide an email address.
+  #
+  #  Specify a social_media_url where others can refer to, for example a twitter
+  #  profile URL.
+  #
+
+
+  s.authors            = {
+    "Niels Lohmann" => "nosend@respectmyprivacy.com"
+  }
+  # s.social_media_url   = "http://twitter.com/todo"
+
+  # ――― Platform Specifics ――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  If this Pod runs only on iOS or OS X, then specify the platform and
+  #  the deployment target. You can optionally include the target after the platform.
+  #
+
+  # s.platform     = :ios
+  s.platform     = :ios, "8.0"
+
+  #  When using multiple platforms
+  # s.ios.deployment_target = "5.0"
+  # s.osx.deployment_target = "10.7"
+  # s.watchos.deployment_target = "2.0"
+  # s.tvos.deployment_target = "9.0"
+
+
+  # ――― Source Location ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  Specify the location from where the source should be retrieved.
+  #  Supports git, hg, bzr, svn and HTTP.
+  #
+
+  s.source       = { :git => "https://github.com/nlohmann/json.git", :tag => "v#{s.version}" }
+
+
+  # ――― Source Code ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  CocoaPods is smart about how it includes source code. For source files
+  #  giving a folder will include any swift, h, m, mm, c & cpp files.
+  #  For header files it will include any header in the folder.
+  #  Not including the public_header_files will make all headers public.
+  #
+
+  s.source_files  = "cocoapods/**/*.{h,m,mm}", "single_include/**/*.hpp"
+  s.exclude_files = "Classes/Exclude"
+
+  s.public_header_files = "single_include/nlohmann/json.hpp"
+
+
+  # ――― Resources ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  A list of resources included with the Pod. These are copied into the
+  #  target bundle with a build phase script. Anything else will be cleaned.
+  #  You can preserve files from being cleaned, please don't preserve
+  #  non-essential files like tests, examples and documentation.
+  #
+
+  # s.resource  = "icon.png"
+  # s.resources = "Resources/*.png"
+
+  # s.preserve_paths = "FilesToSave", "MoreFilesToSave"
+end