String Theory 2.3

• Fix char8_t and std::u8string detection when the compiler supports it but the selected C++ standard does not.
• Fix a potential infinite loop when substituting bad UTF-8 sequences in ST::string.
• Add c_str() methods to ST::buffer<T>.
• Add _stbuf user literal operator and ST_(CHAR|WCHAR|UTF16|UTF32)_LITERAL macros.
• Improve performance of ST::format and friends when formatting floating point values.
• Apply forwarding of ST::format and friends format arguments to reduce copying.

String Theory 2.2

• Use /std:c++latest on MSVC 2017 and 2019 (#10)
• Fix incorrect bitmask when decoding UTF-16 surrogate pairs.
• Multiple performance improvements for string comparisons
• Support the use of std::experimental:: versions of std::filesystem and std::string_view in parallel with the non-experimental versions where possible.
• Add ST::string::set_validated() and ST::string::from_validated() as a faster alternative to construction with ST::assume_valid.
• Add support for C++20 char8_t and std::u8string types

String Theory 2.1

• Fix major bug in ST::buffer<T>::operator==() and ST::buffer<T>::allocate(size, fill) for types of T larger than char.
• Fix ST::string_stream::operator<<() for float and double not actually writing the value to the stream.
• Fix potential undefined behavior formatting -(MAX_*) integers.
• Add more unit tests for the fixed cases and others.
• Slight performance improvement for simple integer formatters.
• Guarantee case insensitive conversions and comparisons occur in the "C" locale.
• Remove <cstring> include from public headers.

String Theory 1.8

• Fix major bug in ST::buffer<T>::operator==() for types of T larger than char.
• Fix ST::string_stream::operator<<() for float and double not actually writing the value to the stream.
• Add more unit tests.

String Theory 2.0

• Add support for reordering and reusing format parameters as "{&1}" in formatting functions.
• Add support for std::string_view and friends.
• Rename is_empty to empty and char_at to at for better compatibility with STL.
  Note that the old names are still available, but will show a deprecation warning unless ST_NO_2_0_DEPRECATION is defined.
• Add STL-style iterator methods, including back, front, [c|r]begin, [c|r]end and necessary typedefs.
• Add ST::writef for STL-style (std::ostream-derived) streams.
• Add operator<< and operator>> overloads for using ST::string with STL-style streams.
• Simplified the necessary overhead for creating new formatting functions.
• Change buffer classes to be writable (but not resizable) for easier construction and manipulation as buffers.
  Note that create_writable_buffer is still available, but will show a deprecation warning unless ST_NO_2_0_DEPRECATION is defined.
• Optimized several parts of string_theory for better performance, especially around string construction, character access, and encoding conversions.
• Fix UTF-16 invalid surrogate pair replacements producing non-canonical results.
• Moved documentation to the Github wiki and cleaned it up for easier maintenance and use.

String Theory 1.7

• Add more support for char16_t and char32_t string literals and conversions.
• Add support for std::u16string and std::u32string from C++11
• Optimize ST::string::c_str() for the most common use case (no alternate string)
• Fix ST::hash_i to correctly hash case-insensitively
• Add explicit std::hash specialization for ST::string for easier use in STL containers
• Fix compile issues on GCC 4.4 (CentOS/RHEL 6)
• Fix tests on MSVC 2017

String Theory 1.6

• Add operator+ and operator+= overloads to ST::string to append/prepend individual characters.
• Add find and find_last overloads that take a starting and ending position, respectively.
• Add support for gcov/lcov coverage analysis in the test suite.

String Theory 1.5

• Fix for exceptions thrown in the ST::string move constructor destroying the original data too early (#5)

String Theory 1.4

• Allow ST::printf to be called with 0 formattable arguments (e.g. ST::printf("Hello\n");)
• Fix ST::hex_encode to output lower-case hex, as per the documentation.
• Fix hard-coded paths in generated CMake files so installs are relocatable.

NOTE: Minimum CMake version is now 2.8.12.

string_theory 1.3

• Fix several warnings in CMake and newer MSVC++ versions
• Allow a NULL data pointer in ST::base64_encode and ST::hex_encode iff size == 0