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Add helpers for implementing uniform integer distribution

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* Utility for extended mult n x n bits -> 2n bits
* Utility to adapt output from URBG to target (unsigned) integral
  type
* Utility to reorder signed values into unsigned type while keeping
  the order.
This commit is contained in:
Martin Hořeňovský
2023-11-28 23:26:06 +01:00
parent ab1b079e4d
commit 04a829b0e1
8 changed files with 384 additions and 0 deletions
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27
tests/SelfTest/IntrospectiveTests/RandomNumberGeneration.tests.cpp
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@@ -8,6 +8,7 @@
#include <catch2/catch_test_macros.hpp>
#include <catch2/catch_template_test_macros.hpp>
#include <catch2/internal/catch_random_integer_helpers.hpp>
#include <catch2/internal/catch_random_number_generator.hpp>
#include <catch2/internal/catch_random_seed_generation.hpp>
#include <catch2/internal/catch_uniform_floating_point_distribution.hpp>
@@ -77,3 +78,29 @@ TEMPLATE_TEST_CASE("uniform_floating_point_distribution never returns infs from
REQUIRE_FALSE( std::isnan( ret ) );
}
}
TEST_CASE( "fillBitsFrom - shortening and stretching", "[rng][approvals]" ) {
using Catch::Detail::fillBitsFrom;
// The seed is not important, but the numbers below have to be repeatable.
// They should also exhibit the same general pattern of being prefixes
Catch::SimplePcg32 pcg( 0xaabb'ccdd );
SECTION( "Shorten to 8 bits" ) {
// We cast the result to avoid dealing with char-like type in uint8_t
auto shortened = static_cast<uint32_t>( fillBitsFrom<uint8_t>( pcg ) );
REQUIRE( shortened == 0xcc );
}
SECTION( "Shorten to 16 bits" ) {
auto shortened = fillBitsFrom<uint16_t>( pcg );
REQUIRE( shortened == 0xccbe );
}
SECTION( "Keep at 32 bits" ) {
auto n = fillBitsFrom<uint32_t>( pcg );
REQUIRE( n == 0xccbe'5f04 );
}
SECTION( "Stretch to 64 bits" ) {
auto stretched = fillBitsFrom<uint64_t>( pcg );
REQUIRE( stretched == 0xccbe'5f04'a424'a486 );
}
}