Release date: 2019-07-28
SHA-256: a503214947952b69f0062f572cb74c17582a495767446347ce2e452963fc2ca4 (json.hpp), 541c34438fd54182e9cdc68dd20c898d766713ad6d901fb2c6e28ff1f1e7c10d (include.zip)

Summary

This release introduces a few convenience functions and performs a lot of house keeping (bug fixes and small improvements). All changes are backward-compatible.

✨ New Features

• Add overload of the contains function to check if a JSON pointer is valid without throwing exceptions, just like its counterpart for object keys. #1600
• Add a function to_string to allow for generic conversion to strings. #916 #1585
• Add return value for the emplace_back function, returning a reference to the added element just like C++17 is introducing this for std::vector. #1609
• Add info how to use the library with the pacman package manager on MSYS2. #1670

🐛 Bug Fixes

• Fix an issue where typedefs with certain names yielded a compilation error. #1642 #1643
• Fix a conversion to std::string_view in the unit tests. #1634 #1639
• Fix MSVC Debug build. #1536 #1570 #1608
• Fix get_to method to clear existing content before writing. #1511 #1555
• Fix a -Wc++17-extensions warning. nodiscard attributes are now only used with Clang when -std=c++17 is used. #1535 #1551

⚡ Improvements

• Switch from Catch to doctest for the unit tests which speeds up compilation and runtime of the 112,112,308 tests.
• Add an explicit section to the README about the frequently addressed topics character encoding, comments in JSON, and the order of object keys.

🔨 Further Changes

• Use GNUInstallDirs to set library install directories. #1673
• Fix links in the README. #1620 #1621 #1622 #1623 #1625
• Mention json type on the documentation start page. #1616
• Complete documentation of value() function with respect to type_error.302 exception. #1601
• Fix links in the documentation. #1598
• Add regression tests for MSVC. #1543 #1570
• Use CircleCI for continuous integration.
• Use Doozer for continuous integration on Linux (CentOS, Raspbian, Fedora)
• Add tests to check each CMake flag (JSON_BuildTests, JSON_Install, JSON_MultipleHeaders, JSON_Sanitizer, JSON_Valgrind, JSON_NoExceptions, JSON_Coverage).
• Use Hedley to avoid re-inventing several compiler-agnostic feature macros like JSON_DEPRECATED, JSON_NODISCARD, JSON_LIKELY, JSON_UNLIKELY, JSON_HAS_CPP_14, or JSON_HAS_CPP_17. Functions taking or returning pointers are annotated accordingly when a pointer will not be null.
• Build and run tests on AppVeyor in DEBUG and RELEASE mode.

🔥 Deprecated functions

This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

• Function iterator_wrapper are deprecated. Please use the member function items() instead.
• Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.