Try recovering a few coverage lines

boost/multiprecision/uintwide_t_backend.hpp

@@ -170,9 +170,9 @@
              std::enable_if_t<std::is_floating_point<FloatingPointType>::value> const* = nullptr>
     constexpr uintwide_t_backend(FloatingPointType f) : m_value(representation_type(static_cast<long double>(f))) { } // NOLINT(google-explicit-constructor,hicpp-explicit-conversions)
 
-    constexpr uintwide_t_backend(const char* c) : m_value(c) { } // NOLINT(google-explicit-constructor,hicpp-explicit-conversions)
+    constexpr explicit uintwide_t_backend(const char* p_cstr) : m_value(p_cstr) { }
 
-    constexpr uintwide_t_backend(const std::string& str) : m_value(str) { } // NOLINT(google-explicit-constructor,hicpp-explicit-conversions)
+    constexpr explicit uintwide_t_backend(const std::string& str) : m_value(str) { }
 
     //constexpr
     ~uintwide_t_backend() = default;

test/test.cpp

@@ -12,20 +12,20 @@
 // -I/mnt/c/boost/modular_boost/boost/libs/config/include -I/mnt/c/boost/modular_boost/boost/libs/multiprecision/include
 
 // When using -std=c++14/20 and g++
-// g++ -finline-functions -march=native -mtune=native -O3 -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -std=c++14 -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -DWIDE_INTEGER_HAS_MUL_8_BY_8_UNROLL -I. -I/mnt/c/boost/boost_1_84_0 -pthread -lpthread test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp examples/example000a_builtin_convert.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe
-// g++ -finline-functions -march=native -mtune=native -O3 -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -std=c++20 -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -DWIDE_INTEGER_HAS_MUL_8_BY_8_UNROLL -I. -I/mnt/c/boost/boost_1_84_0 -pthread -lpthread test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp examples/example000a_builtin_convert.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe
+// g++ -finline-functions -march=native -mtune=native -O3 -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -std=c++14 -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -DWIDE_INTEGER_HAS_MUL_8_BY_8_UNROLL -I. -I/mnt/c/boost/boost_1_85_0 -pthread -lpthread test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp examples/example000a_builtin_convert.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe
+// g++ -finline-functions -march=native -mtune=native -O3 -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -std=c++20 -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -DWIDE_INTEGER_HAS_MUL_8_BY_8_UNROLL -I. -I/mnt/c/boost/boost_1_85_0 -pthread -lpthread test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp examples/example000a_builtin_convert.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe
 
 // cd .tidy/make
-// make prepare -f make_tidy_01_generic.gmk MY_BOOST_ROOT=/mnt/c/boost/boost_1_84_0
-// make tidy -f make_tidy_01_generic.gmk --jobs=8 MY_BOOST_ROOT=/mnt/c/boost/boost_1_84_0
+// make prepare -f make_tidy_01_generic.gmk MY_BOOST_ROOT=/mnt/c/boost/boost_1_85_0
+// make tidy -f make_tidy_01_generic.gmk --jobs=8 MY_BOOST_ROOT=/mnt/c/boost/boost_1_85_0
 
 // cd .gcov/make
-// make prepare -f make_gcov_01_generic.gmk MY_ALL_COV=0 MY_BOOST_ROOT=/mnt/c/boost/boost_1_84_0 MY_CC=g++
-// make gcov -f make_gcov_01_generic.gmk --jobs=8 MY_ALL_COV=0 MY_BOOST_ROOT=/mnt/c/boost/boost_1_84_0 MY_CC=g++
+// make prepare -f make_gcov_01_generic.gmk MY_ALL_COV=0 MY_BOOST_ROOT=/mnt/c/boost/boost_1_85_0 MY_CC=g++
+// make gcov -f make_gcov_01_generic.gmk --jobs=8 MY_ALL_COV=0 MY_BOOST_ROOT=/mnt/c/boost/boost_1_85_0 MY_CC=g++
 
 // cd /mnt/c/Users/User/Documents/Ks/PC_Software/NumericalPrograms/ExtendedNumberTypes/wide_integer
 // PATH=/home/chris/coverity/cov-analysis-linux64-2023.6.2/bin:$PATH
-// cov-build --dir cov-int g++ -finline-functions -march=native -mtune=native -O3 -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -std=c++14 -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -DWIDE_INTEGER_HAS_MUL_8_BY_8_UNROLL -I. -I/mnt/c/boost/boost_1_84_0 -pthread -lpthread test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp examples/example000a_builtin_convert.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe
+// cov-build --dir cov-int g++ -finline-functions -march=native -mtune=native -O3 -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -std=c++14 -DWIDE_INTEGER_HAS_LIMB_TYPE_UINT64 -DWIDE_INTEGER_HAS_MUL_8_BY_8_UNROLL -I. -I/mnt/c/boost/boost_1_85_0 -pthread -lpthread test/test.cpp test/test_uintwide_t_boost_backend.cpp test/test_uintwide_t_edge_cases.cpp test/test_uintwide_t_examples.cpp test/test_uintwide_t_float_convert.cpp test/test_uintwide_t_int_convert.cpp test/test_uintwide_t_n_base.cpp test/test_uintwide_t_n_binary_ops_base.cpp examples/example000a_builtin_convert.cpp test/test_uintwide_t_spot_values.cpp examples/example000_numeric_limits.cpp examples/example001_mul_div.cpp examples/example001a_div_mod.cpp examples/example002_shl_shr.cpp examples/example003_sqrt.cpp examples/example003a_cbrt.cpp examples/example004_rootk_pow.cpp examples/example005_powm.cpp examples/example005a_pow_factors_of_p99.cpp examples/example006_gcd.cpp examples/example007_random_generator.cpp examples/example008_miller_rabin_prime.cpp examples/example008a_miller_rabin_prime.cpp examples/example009_timed_mul.cpp examples/example009a_timed_mul_4_by_4.cpp examples/example009b_timed_mul_8_by_8.cpp examples/example010_uint48_t.cpp examples/example011_uint24_t.cpp examples/example012_rsa_crypto.cpp examples/example013_ecdsa_sign_verify.cpp examples/example014_pi_spigot_wide.cpp -o wide_integer.exe
 // tar caf wide-integer.bz2 cov-int
 
 #include <ctime>

test/test_uintwide_t_edge_cases.cpp

@@ -2547,6 +2547,43 @@ auto test_export_bits() -> bool // NOLINT(readability-function-cognitive-complex
   return result_is_ok;
 }
 
+auto test_edge_uintwide_t_backend() -> bool
+{
+  using local_small_uintwide_t_backend_type = boost::multiprecision::uintwide_t_backend<local_edge_cases::local_digits2_small>;
+
+  using local_small_uintwide_t_type = boost::multiprecision::number<local_small_uintwide_t_backend_type, boost::multiprecision::et_off>;
+
+  auto result_is_ok = true;
+
+  {
+    // This odd-looking code is intended to pick up some non-covered lines
+    // in the Boost-intended uintwide_t_backend class.
+
+    local_small_uintwide_t_type gcd_max { 0 };
+
+    for(auto   i = static_cast<unsigned>(UINT8_C(0));
+               i < static_cast<unsigned>(UINT32_C(64));
+             ++i)
+    {
+      const auto u = generate_wide_integer_value<local_small_uintwide_t_type>();
+      const auto v = generate_wide_integer_value<local_small_uintwide_t_type>();
+
+      const auto gcd_uv = gcd(-u, -v);
+
+      if(gcd_uv > gcd_max)
+      {
+        gcd_max = gcd_uv;
+      }
+    }
+
+    const bool result_gcd_is_ok = (gcd_max > 0);
+
+    result_is_ok = (result_gcd_is_ok && result_is_ok);
+  }
+
+  return result_is_ok;
+}
+
 } // namespace test_uintwide_t_edge
 
 // LCOV_EXCL_START
@@ -2574,6 +2611,7 @@ auto ::math::wide_integer::test_uintwide_t_edge_cases() -> bool
   result_is_ok = (test_uintwide_t_edge::test_to_and_from_chars_and_to_string() && result_is_ok);
   result_is_ok = (test_uintwide_t_edge::test_import_bits                    () && result_is_ok);
   result_is_ok = (test_uintwide_t_edge::test_export_bits                    () && result_is_ok);
+  result_is_ok = (test_uintwide_t_edge::test_edge_uintwide_t_backend        () && result_is_ok);
 
   return result_is_ok;
 }