Add skeleton.

.editorconfig

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+# Configuration file for EditorConfig.
+# More information is available under <https://editorconfig.org/>.
+
+root = true
+
+[*]
+indent_style = space
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 80
+
+[*.?pp]
+indent_size = 4
+tab_width = 4
+
+[{CMakeLists.txt,*.cmake}]
+indent_size = 2
+tab_width = 2

.gitignore

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+/build/
+/doc/

CMakeLists.txt

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+# Support version 3.9 and above, but use policy settings up to 3.14.
+# 3.9 is needed for project description.
+cmake_minimum_required(VERSION 3.9...3.14)
+# Ranges are supported from 3.12, set policy to current for < 3.12.
+if(${CMAKE_VERSION} VERSION_LESS 3.12)
+  cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
+endif()
+
+# Global build options.
+set(CMAKE_BUILD_TYPE "Release" CACHE STRING "The type of build.")
+option(BUILD_SHARED_LIBS "Build shared libraries." YES)
+
+project(mastodonpp
+  VERSION 0.0.0
+  DESCRIPTION "C++ wrapper for the Mastodon API."
+  LANGUAGES CXX)
+
+list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
+
+# Project build options.
+# option(WITH_TESTS "Compile tests." NO)
+# option(WITH_DOC "Generate HTML documentation." YES)
+# option(WITH_EXAMPLES "Compile examples." NO)
+# option(WITH_DEB "Prepare for the building of .deb packages." NO)
+# option(WITH_RPM "Prepare for the building of .rpm packages." NO)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+include(debug_flags)
+
+add_subdirectory(src)
+
+# if(WITH_TESTS)
+#   add_subdirectory(tests)
+# endif()
+
+# include(cmake/packages.cmake)

cmake/debug_flags.cmake

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+# Set compiler flags for Debug builds.
+# Only has an effect on GCC/Clang >= 5.0.
+
+set(DEBUG_CXXFLAGS "")
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang"
+    AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "5")
+  list(APPEND DEBUG_CXXFLAGS
+    "-Wall"
+    "-Wextra"
+    "-Wpedantic"
+    "-Wuninitialized"
+    "-Wshadow"
+    "-Wnon-virtual-dtor"
+    "-Wconversion"
+    "-Wsign-conversion"
+    "-Wold-style-cast"
+    "-Wzero-as-null-pointer-constant"
+    "-Wmissing-declarations"
+    "-Wcast-align"
+    "-Wunused"
+    "-Woverloaded-virtual"
+    "-Wdouble-promotion"
+    "-Wformat=2"
+    "-ftrapv"
+    "-fsanitize=undefined"
+    "-g"
+    "-Og"
+    "-fno-omit-frame-pointer")
+  if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+    list(APPEND DEBUG_CXXFLAGS
+      "-Wlogical-op"
+      "-Wuseless-cast")
+    if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "6")
+      list(APPEND DEBUG_CXXFLAGS
+        "-Wmisleading-indentation"
+        "-Wduplicated-cond"
+        "-Wnull-dereference")
+      if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "7")
+        list(APPEND DEBUG_CXXFLAGS
+          "-Wduplicated-branches")
+      endif()
+    endif()
+  endif()
+  add_compile_options("$<$<CONFIG:Debug>:${DEBUG_CXXFLAGS}>")
+
+  set(DEBUG_LDFLAGS
+    "-fsanitize=undefined")
+  # add_link_options was introduced in version 3.13.
+  if(${CMAKE_VERSION} VERSION_LESS 3.13)
+    set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${DEBUG_LDFLAGS}")
+  else()
+    add_link_options("$<$<CONFIG:Debug>:${DEBUG_LDFLAGS}>")
+  endif()
+else()
+  message(STATUS
+    "No additional compiler flags were set, "
+    "because your compiler was not anticipated.")
+endif()

include/mastodonpp.hpp

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+/*  This file is part of mastodonpp.
+ *  Copyright © 2020 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MASTODONPP_HPP
+#define MASTODONPP_HPP
+
+#include <string>
+
+namespace mastodonpp
+{
+
+using std::string;
+
+class API
+{
+public:
+    explicit API(string instance, string access_token);
+
+private:
+    const string _instance;
+    const string _access_token;
+};
+
+} // namespace mastodonpp
+
+#endif  // MASTODONPP_HPP

src/CMakeLists.txt

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+include(GNUInstallDirs)
+
+file(GLOB_RECURSE sources_lib *.cpp)
+file(GLOB_RECURSE headers_lib ../include/*.hpp)
+
+add_library(${PROJECT_NAME} "${sources_lib}" "${headers_lib}")
+
+set_target_properties(${PROJECT_NAME} PROPERTIES
+  VERSION ${PROJECT_VERSION}
+  SOVERSION ${${PROJECT_NAME}_VERSION_MAJOR})
+
+target_include_directories(${PROJECT_NAME}
+  PRIVATE
+  "$<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/src>" # version.hpp
+  PUBLIC
+  "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>"
+  "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
+
+# target_link_libraries(${PROJECT_NAME}
+#   PRIVATE
+#   PUBLIC)
+
+
+install(TARGETS ${PROJECT_NAME}
+  EXPORT "${PROJECT_NAME}Targets"
+  LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+  ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}")

src/mastodonpp.cpp

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+/*  This file is part of mastodonpp.
+ *  Copyright © 2020 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "mastodonpp.hpp"
+
+#include <utility>
+
+namespace mastodonpp
+{
+
+using std::move;
+
+API::API(string instance, string access_token)
+    : _instance{move(instance)}
+    , _access_token{move(access_token)}
+{}
+
+} // namespace mastodonpp