diff --git a/CMakeLists.txt b/CMakeLists.txt
index c6ef79e..05281a7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,7 @@ add_subdirectory(src/myx/base)
 add_subdirectory(src/myx/filesystem)
 add_subdirectory(src/myx/qt)
 add_subdirectory(src/myx/math)
-add_subdirectory(src/myx/redis)
+# add_subdirectory(src/myx/redis)
 
 # Примеры
 if(MYXLIB_BUILD_EXAMPLES OR MYXLIB_BUILD_EXAMPLES_HO)
diff --git a/src/myx/filesystem/CMakeLists.txt b/src/myx/filesystem/CMakeLists.txt
index b38ea82..5ac2d98 100644
--- a/src/myx/filesystem/CMakeLists.txt
+++ b/src/myx/filesystem/CMakeLists.txt
@@ -3,12 +3,10 @@ set(TRGT filesystem)
 
 # cmake-format: off
 # Список файлов исходных текстов
-if(NOT MYXLIB_HEADER_ONLY)
 set(TRGT_cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/current_executable.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/paths.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/paths_mt.cpp)
-endif()
 
 # Список заголовочных файлов
 set(TRGT_hpp
diff --git a/src/myx/filesystem/current_executable.cpp b/src/myx/filesystem/current_executable.cpp
index ecbbf76..53c42a4 100644
--- a/src/myx/filesystem/current_executable.cpp
+++ b/src/myx/filesystem/current_executable.cpp
@@ -1,2 +1 @@
-#include <myx/filesystem/current_executable.hpp>
 #include <myx/filesystem/current_executable-inl.hpp>
diff --git a/src/myx/filesystem/paths.cpp b/src/myx/filesystem/paths.cpp
index f8027f4..cbe3512 100644
--- a/src/myx/filesystem/paths.cpp
+++ b/src/myx/filesystem/paths.cpp
@@ -1,2 +1 @@
-#include <myx/filesystem/paths.hpp>
 #include <myx/filesystem/paths-inl.hpp>
diff --git a/src/myx/filesystem/paths_mt.cpp b/src/myx/filesystem/paths_mt.cpp
index d02def6..d093dae 100644
--- a/src/myx/filesystem/paths_mt.cpp
+++ b/src/myx/filesystem/paths_mt.cpp
@@ -1,2 +1 @@
-#include <myx/filesystem/paths_mt.hpp>
 #include <myx/filesystem/paths_mt-inl.hpp>
diff --git a/src/myx/math/CMakeLists.txt b/src/myx/math/CMakeLists.txt
index 266b98c..6cbd061 100644
--- a/src/myx/math/CMakeLists.txt
+++ b/src/myx/math/CMakeLists.txt
@@ -3,7 +3,7 @@ set(TRGT math)
 
 # cmake-format: off
 # Список файлов исходных текстов
-set(TRGT_sources
+set(TRGT_cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_relative.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_relative_and_abs.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_ulps.cpp
@@ -14,10 +14,15 @@ set(TRGT_sources
 set(TRGT_hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/all.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_relative.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_relative-inl.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_relative_and_abs.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_relative_and_abs-inl.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_ulps.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_ulps-inl.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_ulps_and_abs.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/almost_equal_ulps_and_abs-inl.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/constants.hpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/constants-inl.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/float_cmp_types.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/functions.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/radar.hpp
@@ -27,13 +32,14 @@ set(TRGT_headers ${TRGT_hpp})
 # cmake-format: on
 
 add_library(${TRGT}-header-only INTERFACE)
+target_sources(${TRGT}-header-only INTERFACE ${TRGT_headers})
 target_include_directories(
   ${TRGT}-header-only SYSTEM INTERFACE "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
                                        "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
 
 if(MYXLIB_BUILD_LIBRARIES)
 
-  add_common_library(${TRGT} OUTPUT_NAME myx-${TRGT} SOURCES ${TRGT_sources} ${TRGT_headers})
+  add_common_library(${TRGT} OUTPUT_NAME myx-${TRGT} SOURCES ${TRGT_cpp} ${TRGT_headers})
   common_target_properties(${TRGT})
 
   # Создание цели для проверки утилитой clang-tidy
diff --git a/src/myx/math/almost_equal_relative-inl.hpp b/src/myx/math/almost_equal_relative-inl.hpp
new file mode 100644
index 0000000..fa2a225
--- /dev/null
+++ b/src/myx/math/almost_equal_relative-inl.hpp
@@ -0,0 +1,44 @@
+#ifndef MYXLIB_HEADER_ONLY
+#include <myx/math/almost_equal_relative.hpp>
+#endif
+
+#include <cmath>
+
+namespace myx {
+
+namespace math {
+
+bool almost_equal_relative( const float a, const float b,
+                            const float maxRelDiff )
+{
+	float diff    = fabsf( a - b );
+	float aN      = fabsf( a );
+	float bN      = fabsf( b );
+	float largest = ( bN > aN ) ? bN : aN;
+
+	if ( diff <= largest * maxRelDiff )
+	{
+		return( true );
+	}
+	return( false );
+}
+
+
+bool almost_equal_relative( const double a, const double b,
+                            const double maxRelDiff )
+{
+	double diff    = fabs( a - b );
+	double aN      = fabs( a );
+	double bN      = fabs( b );
+	double largest = ( bN > aN ) ? bN : aN;
+
+	if ( diff <= largest * maxRelDiff )
+	{
+		return( true );
+	}
+	return( false );
+}
+
+} // namespace math
+
+} // namespace myx
diff --git a/src/myx/math/almost_equal_relative.cpp b/src/myx/math/almost_equal_relative.cpp
index 824c337..bc79e13 100644
--- a/src/myx/math/almost_equal_relative.cpp
+++ b/src/myx/math/almost_equal_relative.cpp
@@ -1,42 +1 @@
-#include <myx/math/almost_equal_relative.hpp>
-
-#include <cmath>
-
-namespace myx {
-
-namespace math {
-
-bool almost_equal_relative( const float a, const float b,
-                            const float maxRelDiff )
-{
-	float diff    = fabsf( a - b );
-	float aN      = fabsf( a );
-	float bN      = fabsf( b );
-	float largest = ( bN > aN ) ? bN : aN;
-
-	if ( diff <= largest * maxRelDiff )
-	{
-		return( true );
-	}
-	return( false );
-}
-
-
-bool almost_equal_relative( const double a, const double b,
-                            const double maxRelDiff )
-{
-	double diff    = fabs( a - b );
-	double aN      = fabs( a );
-	double bN      = fabs( b );
-	double largest = ( bN > aN ) ? bN : aN;
-
-	if ( diff <= largest * maxRelDiff )
-	{
-		return( true );
-	}
-	return( false );
-}
-
-} // namespace math
-
-} // namespace myx
+#include <myx/math/almost_equal_relative-inl.hpp>
diff --git a/src/myx/math/almost_equal_relative.hpp b/src/myx/math/almost_equal_relative.hpp
index a294761..3fd15ae 100644
--- a/src/myx/math/almost_equal_relative.hpp
+++ b/src/myx/math/almost_equal_relative.hpp
@@ -1,6 +1,8 @@
 #ifndef MYX_MATH_ALMOST_EQUAL_RELATIVE_HPP_
 #define MYX_MATH_ALMOST_EQUAL_RELATIVE_HPP_
 
+#include <myx/base/config.hpp>
+
 #include <cfloat>
 
 // https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
@@ -28,4 +30,8 @@ bool almost_equal_relative( double a, double b,
 
 } // namespace myx
 
+#ifdef MYXLIB_HEADER_ONLY
+#include "almost_equal_relative-inl.hpp"
+#endif
+
 #endif //  MYX_MATH_ALMOST_EQUAL_RELATIVE_HPP_
diff --git a/src/myx/math/almost_equal_relative_and_abs-inl.hpp b/src/myx/math/almost_equal_relative_and_abs-inl.hpp
new file mode 100644
index 0000000..79981f4
--- /dev/null
+++ b/src/myx/math/almost_equal_relative_and_abs-inl.hpp
@@ -0,0 +1,58 @@
+#ifndef MYXLIB_HEADER_ONLY
+#include <myx/math/almost_equal_relative_and_abs.hpp>
+#endif
+
+#include <cmath>
+
+namespace myx {
+
+namespace math {
+
+bool almost_equal_relative_and_abs( const float a, const float b,
+                                    const float maxAbsDiff, const float maxRelDiff )
+{
+	// Check if the numbers are really close -- needed
+	// when comparing numbers near zero.
+	float diff = fabsf( a - b );
+	if ( diff <= maxAbsDiff )
+	{
+		return( true );
+	}
+
+	float aN      = fabsf( a );
+	float bN      = fabsf( b );
+	float largest = ( bN > aN ) ? bN : aN;
+
+	if ( diff <= largest * maxRelDiff )
+	{
+		return( true );
+	}
+	return( false );
+}
+
+
+bool almost_equal_relative_and_abs( const double a, const double b,
+                                    const double maxAbsDiff, const double maxRelDiff )
+{
+	// Check if the numbers are really close -- needed
+	// when comparing numbers near zero.
+	double diff = fabs( a - b );
+	if ( diff <= maxAbsDiff )
+	{
+		return( true );
+	}
+
+	double aN      = fabs( a );
+	double bN      = fabs( b );
+	double largest = ( bN > aN ) ? bN : aN;
+
+	if ( diff <= largest * maxRelDiff )
+	{
+		return( true );
+	}
+	return( false );
+}
+
+} // namespace math
+
+} // namespace myx
diff --git a/src/myx/math/almost_equal_relative_and_abs.cpp b/src/myx/math/almost_equal_relative_and_abs.cpp
index e3b0401..531587a 100644
--- a/src/myx/math/almost_equal_relative_and_abs.cpp
+++ b/src/myx/math/almost_equal_relative_and_abs.cpp
@@ -1,56 +1 @@
-#include <myx/math/almost_equal_relative_and_abs.hpp>
-
-#include <cmath>
-
-namespace myx {
-
-namespace math {
-
-bool almost_equal_relative_and_abs( const float a, const float b,
-                                    const float maxAbsDiff, const float maxRelDiff )
-{
-	// Check if the numbers are really close -- needed
-	// when comparing numbers near zero.
-	float diff = fabsf( a - b );
-	if ( diff <= maxAbsDiff )
-	{
-		return( true );
-	}
-
-	float aN      = fabsf( a );
-	float bN      = fabsf( b );
-	float largest = ( bN > aN ) ? bN : aN;
-
-	if ( diff <= largest * maxRelDiff )
-	{
-		return( true );
-	}
-	return( false );
-}
-
-
-bool almost_equal_relative_and_abs( const double a, const double b,
-                                    const double maxAbsDiff, const double maxRelDiff )
-{
-	// Check if the numbers are really close -- needed
-	// when comparing numbers near zero.
-	double diff = fabs( a - b );
-	if ( diff <= maxAbsDiff )
-	{
-		return( true );
-	}
-
-	double aN      = fabs( a );
-	double bN      = fabs( b );
-	double largest = ( bN > aN ) ? bN : aN;
-
-	if ( diff <= largest * maxRelDiff )
-	{
-		return( true );
-	}
-	return( false );
-}
-
-} // namespace math
-
-} // namespace myx
+#include <myx/math/almost_equal_relative_and_abs-inl.hpp>
diff --git a/src/myx/math/almost_equal_relative_and_abs.hpp b/src/myx/math/almost_equal_relative_and_abs.hpp
index a4fc095..078a7cd 100644
--- a/src/myx/math/almost_equal_relative_and_abs.hpp
+++ b/src/myx/math/almost_equal_relative_and_abs.hpp
@@ -1,6 +1,8 @@
 #ifndef MYX_MATH_ALMOST_EQUAL_RELATIVE_AND_ABS_HPP_
 #define MYX_MATH_ALMOST_EQUAL_RELATIVE_AND_ABS_HPP_
 
+#include <myx/base/config.hpp>
+
 #include <cfloat>
 
 namespace myx {
@@ -28,4 +30,8 @@ bool almost_equal_relative_and_abs( double a, double b,
 
 } // namespace myx
 
+#ifdef MYXLIB_HEADER_ONLY
+#include "almost_equal_relative_and_abs-inl.hpp"
+#endif
+
 #endif // MYX_MATH_ALMOST_EQUAL_RELATIVE_AND_ABS_HPP_
diff --git a/src/myx/math/almost_equal_ulps-inl.hpp b/src/myx/math/almost_equal_ulps-inl.hpp
new file mode 100644
index 0000000..702ed8f
--- /dev/null
+++ b/src/myx/math/almost_equal_ulps-inl.hpp
@@ -0,0 +1,86 @@
+#ifndef MYXLIB_HEADER_ONLY
+#include <myx/math/almost_equal_ulps.hpp>
+#endif
+
+#include <myx/math/float_cmp_types.hpp>
+
+#include <cmath>
+
+namespace myx {
+
+namespace math {
+
+bool almost_equal_ulps( const float a, const float b,
+                        const int maxUlpsDiff )
+{
+	FloatCmp uA( a );
+	FloatCmp uB( b );
+
+	// Если знаки разные, то числа не равны.
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
+	if ( uA.negative() != uB.negative() )
+	{
+		// Кроме случая, когда +0==-0
+		#ifdef __GNUC__
+		#pragma GCC diagnostic push
+		#pragma GCC diagnostic ignored "-Wfloat-equal"
+		#endif
+		if ( a == b ) // -V550
+		#ifdef __GNUC__
+		#pragma GCC diagnostic pop
+		#endif
+		{
+			return( true );
+		}
+		return( false );
+	}
+
+	// Разница в младших битах.
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
+	auto ulpsDiff = std::abs( uA.i - uB.i );
+	if ( ulpsDiff <= maxUlpsDiff )
+	{
+		return( true );
+	}
+	return( false );
+} // almost_equal_ulps
+
+
+bool almost_equal_ulps( const double a, const double b,
+                        const int maxUlpsDiff )
+{
+	DoubleCmp uA( a );
+	DoubleCmp uB( b );
+
+	// Если знаки разные, то числа не равны.
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
+	if ( uA.negative() != uB.negative() )
+	{
+		// Кроме случая, когда +0==-0
+		#ifdef __GNUC__
+		#pragma GCC diagnostic push
+		#pragma GCC diagnostic ignored "-Wfloat-equal"
+		#endif
+		if ( a == b ) // -V550
+		#ifdef __GNUC__
+		#pragma GCC diagnostic pop
+		#endif
+		{
+			return( true );
+		}
+		return( false );
+	}
+
+	// Разница в младших битах.
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
+	auto ulpsDiff = std::abs( uA.i - uB.i );
+	if ( ulpsDiff <= maxUlpsDiff )
+	{
+		return( true );
+	}
+	return( false );
+} // almost_equal_ulps
+
+} // namespace math
+
+} // namespace myx
diff --git a/src/myx/math/almost_equal_ulps.cpp b/src/myx/math/almost_equal_ulps.cpp
index 9beb2d6..772dffd 100644
--- a/src/myx/math/almost_equal_ulps.cpp
+++ b/src/myx/math/almost_equal_ulps.cpp
@@ -1,83 +1 @@
-#include <myx/math/almost_equal_ulps.hpp>
-#include <myx/math/float_cmp_types.hpp>
-
-#include <cmath>
-
-namespace myx {
-
-namespace math {
-
-bool almost_equal_ulps( const float a, const float b,
-                        const int maxUlpsDiff )
-{
-	FloatCmp uA( a );
-	FloatCmp uB( b );
-
-	// Если знаки разные, то числа не равны.
-	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
-	if ( uA.negative() != uB.negative() )
-	{
-		// Кроме случая, когда +0==-0
-		#ifdef __GNUC__
-		#pragma GCC diagnostic push
-		#pragma GCC diagnostic ignored "-Wfloat-equal"
-		#endif
-		if ( a == b ) // -V550
-		#ifdef __GNUC__
-		#pragma GCC diagnostic pop
-		#endif
-		{
-			return( true );
-		}
-		return( false );
-	}
-
-	// Разница в младших битах.
-	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
-	auto ulpsDiff = std::abs( uA.i - uB.i );
-	if ( ulpsDiff <= maxUlpsDiff )
-	{
-		return( true );
-	}
-	return( false );
-} // almost_equal_ulps
-
-
-bool almost_equal_ulps( const double a, const double b,
-                        const int maxUlpsDiff )
-{
-	DoubleCmp uA( a );
-	DoubleCmp uB( b );
-
-	// Если знаки разные, то числа не равны.
-	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
-	if ( uA.negative() != uB.negative() )
-	{
-		// Кроме случая, когда +0==-0
-		#ifdef __GNUC__
-		#pragma GCC diagnostic push
-		#pragma GCC diagnostic ignored "-Wfloat-equal"
-		#endif
-		if ( a == b ) // -V550
-		#ifdef __GNUC__
-		#pragma GCC diagnostic pop
-		#endif
-		{
-			return( true );
-		}
-		return( false );
-	}
-
-	// Разница в младших битах.
-	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
-	auto ulpsDiff = std::abs( uA.i - uB.i );
-	if ( ulpsDiff <= maxUlpsDiff )
-	{
-		return( true );
-	}
-	return( false );
-} // almost_equal_ulps
-
-} // namespace math
-
-} // namespace myx
+#include <myx/math/almost_equal_ulps-inl.hpp>
diff --git a/src/myx/math/almost_equal_ulps.hpp b/src/myx/math/almost_equal_ulps.hpp
index afdb99d..5d4cc75 100644
--- a/src/myx/math/almost_equal_ulps.hpp
+++ b/src/myx/math/almost_equal_ulps.hpp
@@ -1,6 +1,7 @@
 #ifndef MYX_MATH_ALMOST_EQUAL_ULPS_HPP_
 #define MYX_MATH_ALMOST_EQUAL_ULPS_HPP_
 
+#include <myx/base/config.hpp>
 #include <myx/math/float_cmp_types.hpp>
 
 #include <cmath>
@@ -28,4 +29,8 @@ bool almost_equal_ulps( double a, double b,
 
 } // namespace myx
 
+#ifdef MYXLIB_HEADER_ONLY
+#include "almost_equal_ulps-inl.hpp"
+#endif
+
 #endif // MYX_MATH_ALMOST_EQUAL_ULPS_HPP_
diff --git a/src/myx/math/almost_equal_ulps_and_abs-inl.hpp b/src/myx/math/almost_equal_ulps_and_abs-inl.hpp
new file mode 100644
index 0000000..bca19ec
--- /dev/null
+++ b/src/myx/math/almost_equal_ulps_and_abs-inl.hpp
@@ -0,0 +1,80 @@
+#ifndef MYXLIB_HEADER_ONLY
+#include <myx/math/almost_equal_ulps_and_abs.hpp>
+#endif
+
+#include <myx/math/float_cmp_types.hpp>
+
+#include <cmath>
+
+namespace myx {
+
+namespace math {
+
+bool almost_equal_ulps_and_abs( const float a, const float b,
+                                const float maxAbsDiff, const int maxUlpsDiff )
+{
+	// Check if the numbers are really close -- needed
+	// when comparing numbers near zero.
+	float absDiff = fabsf( a - b );
+	if ( absDiff <= maxAbsDiff )
+	{
+		return( true );
+	}
+
+	FloatCmp uA( a );
+	FloatCmp uB( b );
+
+	// Different signs means they do not match.
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
+	if ( uA.negative() != uB.negative() )
+	{
+		return( false );
+	}
+
+	// Find the difference in ULPs.
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
+	int ulpsDiff = std::abs( uA.i - uB.i );
+	if ( ulpsDiff <= maxUlpsDiff )
+	{
+		return( true );
+	}
+
+	return( false );
+} // almost_equal_ulps_and_abs
+
+
+bool almost_equal_ulps_and_abs( const double a, const double b,
+                                const double maxAbsDiff, const int maxUlpsDiff )
+{
+	// Check if the numbers are really close -- needed
+	// when comparing numbers near zero.
+	double absDiff = fabs( a - b );
+	if ( absDiff <= maxAbsDiff )
+	{
+		return( true );
+	}
+
+	DoubleCmp uA( a );
+	DoubleCmp uB( b );
+
+	// Different signs means they do not match.
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
+	if ( uA.negative() != uB.negative() )
+	{
+		return( false );
+	}
+
+	// Find the difference in ULPs.
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
+	auto ulpsDiff = std::abs( uA.i - uB.i );
+	if ( ulpsDiff <= maxUlpsDiff )
+	{
+		return( true );
+	}
+
+	return( false );
+} // almost_equal_ulps_and_abs
+
+} // namespace math
+
+} // namespace myx
diff --git a/src/myx/math/almost_equal_ulps_and_abs.cpp b/src/myx/math/almost_equal_ulps_and_abs.cpp
index 09c98f6..a4cfadb 100644
--- a/src/myx/math/almost_equal_ulps_and_abs.cpp
+++ b/src/myx/math/almost_equal_ulps_and_abs.cpp
@@ -1,77 +1 @@
-#include <myx/math/almost_equal_ulps_and_abs.hpp>
-#include <myx/math/float_cmp_types.hpp>
-
-#include <cmath>
-
-namespace myx {
-
-namespace math {
-
-bool almost_equal_ulps_and_abs( const float a, const float b,
-                                const float maxAbsDiff, const int maxUlpsDiff )
-{
-	// Check if the numbers are really close -- needed
-	// when comparing numbers near zero.
-	float absDiff = fabsf( a - b );
-	if ( absDiff <= maxAbsDiff )
-	{
-		return( true );
-	}
-
-	FloatCmp uA( a );
-	FloatCmp uB( b );
-
-	// Different signs means they do not match.
-	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
-	if ( uA.negative() != uB.negative() )
-	{
-		return( false );
-	}
-
-	// Find the difference in ULPs.
-	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
-	int ulpsDiff = std::abs( uA.i - uB.i );
-	if ( ulpsDiff <= maxUlpsDiff )
-	{
-		return( true );
-	}
-
-	return( false );
-} // almost_equal_ulps_and_abs
-
-
-bool almost_equal_ulps_and_abs( const double a, const double b,
-                                const double maxAbsDiff, const int maxUlpsDiff )
-{
-	// Check if the numbers are really close -- needed
-	// when comparing numbers near zero.
-	double absDiff = fabs( a - b );
-	if ( absDiff <= maxAbsDiff )
-	{
-		return( true );
-	}
-
-	DoubleCmp uA( a );
-	DoubleCmp uB( b );
-
-	// Different signs means they do not match.
-	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
-	if ( uA.negative() != uB.negative() )
-	{
-		return( false );
-	}
-
-	// Find the difference in ULPs.
-	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
-	auto ulpsDiff = std::abs( uA.i - uB.i );
-	if ( ulpsDiff <= maxUlpsDiff )
-	{
-		return( true );
-	}
-
-	return( false );
-} // almost_equal_ulps_and_abs
-
-} // namespace math
-
-} // namespace myx
+#include <myx/math/almost_equal_ulps_and_abs-inl.hpp>
diff --git a/src/myx/math/almost_equal_ulps_and_abs.hpp b/src/myx/math/almost_equal_ulps_and_abs.hpp
index abf3ee4..f141795 100644
--- a/src/myx/math/almost_equal_ulps_and_abs.hpp
+++ b/src/myx/math/almost_equal_ulps_and_abs.hpp
@@ -1,6 +1,8 @@
 #ifndef MYX_MATH_ALMOST_EQUAL_ULPS_HPP_
 #define MYX_MATH_ALMOST_EQUAL_ULPS_HPP_
 
+#include <myx/base/config.hpp>
+
 namespace myx {
 
 namespace math {
@@ -26,4 +28,8 @@ bool almost_equal_ulps_and_abs( double a, double b,
 
 } // namespace myx
 
+#ifdef MYXLIB_HEADER_ONLY
+#include "almost_equal_ulps_and_abs-inl.hpp"
+#endif
+
 #endif // MYX_MATH_ALMOST_EQUAL_ULPS_HPP_
diff --git a/src/myx/math/constants-inl.hpp b/src/myx/math/constants-inl.hpp
new file mode 100644
index 0000000..eb22bee
--- /dev/null
+++ b/src/myx/math/constants-inl.hpp
@@ -0,0 +1,11 @@
+#ifndef MYXLIB_HEADER_ONLY
+#include <myx/math/constants.hpp>
+#endif
+
+namespace myx {
+
+namespace math {
+
+} // namespace math
+
+} // namespace myx
diff --git a/src/myx/math/constants.cpp b/src/myx/math/constants.cpp
index 0d35cd7..5351b8f 100644
--- a/src/myx/math/constants.cpp
+++ b/src/myx/math/constants.cpp
@@ -1,9 +1 @@
-#include <myx/math/constants.hpp>
-
-namespace myx {
-
-namespace math {
-
-} // namespace math
-
-} // namespace myx
+#include <myx/math/constants-inl.hpp>
diff --git a/src/myx/math/constants.hpp b/src/myx/math/constants.hpp
index bd2c991..05f16e8 100644
--- a/src/myx/math/constants.hpp
+++ b/src/myx/math/constants.hpp
@@ -1,6 +1,8 @@
 #ifndef MYX_MATH_CONSTANTS_HPP_
 #define MYX_MATH_CONSTANTS_HPP_
 
+#include <myx/base/config.hpp>
+
 #include <cmath>
 #include <type_traits>
 
@@ -8,11 +10,14 @@ namespace myx {
 
 namespace math {
 
-const auto ImpedanceOfFreeSpace = 376.7303136675757;
+const auto ImpedanceOfFreeSpace = (M_PI * 119.9169832);
 
 } // namespace math
 
 } // namespace myx
 
+#ifdef MYXLIB_HEADER_ONLY
+#include "constants-inl.hpp"
+#endif
 
 #endif // MYX_MATH_CONSTANTS_HPP_