Improve code and fix compilation issues with C++98

Author: flanglet

src/BitStreamException.hpp

@@ -48,6 +48,12 @@ namespace kanzi
        {
        }
 
+#if __cplusplus >= 201103L
+       BitStreamException(const BitStreamException&) = default;
+
+       BitStreamException& operator=(const BitStreamException&) = default;
+#endif
+
        int error() const { return _code; }
 
        ~BitStreamException() NOEXCEPT {}

src/concurrent.hpp

@@ -49,20 +49,22 @@ limitations under the License.
    #include <future>
    #include <functional>
    #include <stdexcept>
-#endif
 
-#ifdef __x86_64__
-   #ifdef __clang__
-       #define CPU_PAUSE() __builtin_ia32_pause()
-   #elif __GNUC__
-       #define CPU_PAUSE() __builtin_ia32_pause()
-   #elif _MSC_VER
-       #define CPU_PAUSE() _mm_pause()
+   #ifdef __x86_64__
+      #ifdef __clang__
+          #define CPU_PAUSE() __builtin_ia32_pause()
+      #elif __GNUC__
+          #define CPU_PAUSE() __builtin_ia32_pause()
+      #elif _MSC_VER
+          #define CPU_PAUSE() _mm_pause()
+      #else
+         #define CPU_PAUSE() std::this_thread::yield();
+      #endif
    #else
       #define CPU_PAUSE() std::this_thread::yield();
    #endif
 #else
-   #define CPU_PAUSE() std::this_thread::yield();
+   #define CPU_PAUSE()
 #endif
 
 

src/io/IOException.hpp

@@ -43,6 +43,12 @@ namespace kanzi
            _code = error;
        }
 
+#if __cplusplus >= 201103L
+       IOException(const IOException&) = default;
+
+       IOException& operator=(const IOException&) = default;
+#endif
+
        int error() const { return _code; }
 
        ~IOException() NOEXCEPT {}

src/io/IOUtil.hpp

@@ -23,6 +23,9 @@ limitations under the License.
 #include <sys/stat.h>
 #include <string.h>
 
+#if __cplusplus >= 201703L
+#include <filesystem>
+#endif
 
 #include "../types.hpp"
 
@@ -295,6 +298,12 @@ namespace kanzi
 
    static inline bool samePaths(const std::string& f1, const std::string& f2)
    {
+#if __cplusplus >= 201703L
+      // Simpler and safer code with C++17
+      std::error_code ec;
+      return std::filesystem::equivalent(f1, f2, ec);
+#endif
+
       if (f1.compare(f2) == 0)
          return true;