yowidin / constexpr

Experiments with constexpr

Experiments with constexpr

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