Clean up the external-boost framework.

Exception.test/exception.cc

@@ -24,6 +24,7 @@ namespace
 {
 	namespace util= Alepha::Utility;
 	using namespace Alepha::Testing::exports;
+	namespace boost= Alepha::boost;
 
 	struct tag;
 

ProgramOptions.h

@@ -78,6 +78,7 @@ static_assert( __cplusplus > 2020'00 );
  * an informative message about the parsing error encountered.
  */
 
+#include <Alepha/Alepha.h>
 
 #include <string>
 #include <typeindex>

cmake/rules.cmake

@@ -1,6 +1,7 @@
 #cmake_policy( SET CMP0002 OLD )
 
-add_compile_options( -I ${CMAKE_BINARY_DIR}  ; -std=c++20 ; -I . )
+add_compile_options( -std=c++20 )
+include_directories( ${CMAKE_BINARY_DIR} . )
 
 
 list( APPEND CMAKE_CTEST_ARGUMENTS "-VV" )
@@ -11,6 +12,11 @@ set( CMAKE_VERBOSE_MAKEFILE true )
 
 file( CREATE_LINK ${CMAKE_SOURCE_DIR} Alepha SYMBOLIC )
 
+if( DEFINED ALEPHA_BOOST_PATH )
+file( CREATE_LINK ${CMAKE_BINARY_DIR}/${ALEPHA_BOOST_PATH} boost SYMBOLIC )
+include_directories( ${CMAKE_BINARY_DIR}/${ALEPHA_BOOST_PATH}/.. )
+endif()
+
 
 include(CTest)
 

string_algorithms.h

@@ -2,6 +2,8 @@ static_assert( __cplusplus > 2020'00 );
 
 #pragma once
 
+#include <Alepha/Alepha.h>
+
 #include <cassert>
 
 #include <iostream>