Add conanfile, build and test_package

conan/.gitignore

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+test_package/build
+*.pyc
+conanbuildinfo.cmake
+conaninfo.txt

conan/build.py

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+from conan.packager import ConanMultiPackager
+
+
+if __name__ == "__main__":
+    builder = ConanMultiPackager(username="nlohmann", channel="stable")
+    builder.add_common_builds(pure_c=False)
+    builder.run()

conan/conanfile.py

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+from conans import ConanFile
+from conans.tools import download
+
+class StatsdClient(ConanFile):
+    name = "jsonformoderncpp"
+    version = "2.1.1"
+    license = "MIT"
+    url = "https://github.com/nlohmann/json"
+    author = "Niels Lohmann (mail@nlohmann.me)"
+    settings = None
+    options = {"path": "ANY"}
+    default_options = "path="
+
+    def source(self):
+        download("https://github.com/nlohmann/json/releases/download/v%s/json.hpp" % self.version, "json.hpp")
+
+    def package(self):
+        header_dir = "include"
+        if self.options.path != "":
+            header_dir += "/" + str(self.options.path)
+        self.copy("*.hpp", dst=header_dir)

conan/test_package/.gitignore

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+build/
+conanfile.pyc

conan/test_package/CMakeLists.txt

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+project(PackageTest CXX)
+cmake_minimum_required(VERSION 3.0)
+add_compile_options(-std=c++11)
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup()
+
+add_executable(example example.cpp)
+target_link_libraries(example ${CONAN_LIBS})

conan/test_package/conanfile.py

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+from conans import ConanFile, CMake
+import os
+
+version = "2.1.1"
+channel = os.getenv("CONAN_CHANNEL", "stable")
+username = os.getenv("CONAN_USERNAME", "nlohmann")
+
+
+class RxcppTestConan(ConanFile):
+    settings = "os", "compiler", "build_type", "arch"
+    requires = "jsonformoderncpp/%s@%s/%s" % (version, username, channel)
+    generators = "cmake"
+
+    def build(self):
+        cmake = CMake(self.settings)
+        # Current dir is "test_package/build/<build_id>" and CMakeLists.txt is in "test_package"
+        cmake.configure(self, source_dir=self.conanfile_directory, build_dir="./")
+        cmake.build(self)
+
+    def test(self):
+        os.chdir("bin")
+        self.run(".%sexample" % os.sep)

conan/test_package/example.cpp

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+#include "json.hpp"
+#include <iostream>
+
+using nlohmann::json;
+
+int main()
+{
+    const json myJson = {
+        { "Hello", "World" }
+    };
+
+    for (auto it{ myJson.cbegin() }; it != myJson.cend(); ++it)
+    {
+        std::cout << it.key() << " " << it.value() << std::endl;
+    }
+}