thelartians / constexpr

Experiments with constexpr

Experiments with constexpr

A structurally modernized fork of elbeno/constexpr suited for library use. Some libraries that did not compile on modern clang and gcc have been disabled and moved to the legacy directory. Tests fail to compile on windows, so use with caution.

To add this library to your project, simply use CPM.cmake.

CPMAddPackage(
  NAME constexpr
  GITHUB_REPOSITORY TheLartians/constexpr
  GIT_TAG 0e2279142d7e4f6631659f90894bd7dbb24d082a
)

Everything (with the exception of noted functions) is written in C++11 constexpr style for maximum compatibility.

All functions are within the cx namespace.

This code is distributed under the MIT license. See LICENSE for details.

Math functions

• abs, fabs
• sqrt, cbrt, hypot
• exp, log, log10, log2
• sin, cos, tan
• asin, acos, atan, atan2
• floor, ceil, trunc, round (long double variants require C++14)
• fmod, remainder (long double variants require C++14)
• fmin, fmax, fdim
• sinh, cosh, tanh
• asinh, acosh, atanh
• pow
• erf

String hashing

• fnv1, fnv1a
• murmur3_32
• md5
• sha256

Utility functions

• strlen
• strcmp
• endianswap
• counter: returns monotonically increasing integers with each call (within a given translation unit)

Random number generation

• cx_pcg32: a macro that returns a different random uint32_t with each call
• cx_guidgen: a macro that generates a different random GUID with each call

String encryption

String encryption uses std::make_index_sequence therefore requires C++14.

• cx_make_encrypted_string: a macro that encrypts a string literal, with a runtime conversion to plaintext std::string

Arrays

Arrays use std::make_index_sequence therefore require C++14.

• array<type, size>: a constexpr-friendly array type
• make_array: create an array from e.g. a string literal
• transform: like std::transform but works on constexpr arrays
• reverse
• sort: an implementation of mergesort (stable)
• partition: a stable partition (but use count_if to obtain the partition point)

Algorithms (including Numeric Algorithms)

• accumulate: like std::accumulate but works on constexpr arrays

Similarly:

• all_of, any_of, none_of
• count, count_if
• find, find_if, find_if_not`
• equal, mismatch
• find_first_of
• adjacent_find
• search, search_n
• inner_product