From 13637f56fa5da8f071ae9fdb0251a3365011e7cf Mon Sep 17 00:00:00 2001
From: "chappuis.daniel" <chappuis.daniel@92aac97c-a6ce-11dd-a772-7fcde58d38e6>
Date: Mon, 16 Mar 2009 22:04:55 +0000
Subject: [PATCH] git-svn-id:
 https://reactphysics3d.googlecode.com/svn/trunk@116
 92aac97c-a6ce-11dd-a772-7fcde58d38e6

---
 sources/reactphysics3d/physics/Kilogram.cpp | 17 +++++++++------
 sources/reactphysics3d/physics/Kilogram.h   |  3 ++-
 sources/reactphysics3d/physics/Time.cpp     | 13 ++++++++----
 sources/reactphysics3d/physics/Time.h       | 23 +++++++++++++++------
 4 files changed, 39 insertions(+), 17 deletions(-)

diff --git a/sources/reactphysics3d/physics/Kilogram.cpp b/sources/reactphysics3d/physics/Kilogram.cpp
index 807a6374..ece681cd 100644
--- a/sources/reactphysics3d/physics/Kilogram.cpp
+++ b/sources/reactphysics3d/physics/Kilogram.cpp
@@ -17,14 +17,19 @@
  * along with ReactPhysics3D. If not, see <http://www.gnu.org/licenses/>.   *
  ***************************************************************************/
 
- // Libraries
- #include "Kilogram.h"
+// Libraries
+#include "Kilogram.h"
 
- // We want to use the ReactPhysics3D namespace
- using namespace reactphysics3d;
+// We want to use the ReactPhysics3D namespace
+using namespace reactphysics3d;
 
- // Constructor
- Kilogram::Kilogram(double value) throw(std::invalid_argument) {
+// Constructor
+Kilogram::Kilogram() {
+    value = 0.0;
+}
+
+// Constructor with arguments
+Kilogram::Kilogram(double value) throw(std::invalid_argument) {
     // Check if the value is positive
     if (value >= 0) {
         this->value = value;
diff --git a/sources/reactphysics3d/physics/Kilogram.h b/sources/reactphysics3d/physics/Kilogram.h
index 33f53447..84b9c2f6 100644
--- a/sources/reactphysics3d/physics/Kilogram.h
+++ b/sources/reactphysics3d/physics/Kilogram.h
@@ -37,7 +37,8 @@ class Kilogram {
         double value;                           // Mass value in kilogram
 
     public :
-        Kilogram(double value) throw(std::invalid_argument);        // Constructor
+        Kilogram();                                                 // Constructor
+        Kilogram(double value) throw(std::invalid_argument);        // Constructor with arguments
         Kilogram(const Kilogram& mass);                             // Copy-constructor
         virtual ~Kilogram();                                        // Destructor
 
diff --git a/sources/reactphysics3d/physics/Time.cpp b/sources/reactphysics3d/physics/Time.cpp
index 3ebe04a4..f145ec36 100644
--- a/sources/reactphysics3d/physics/Time.cpp
+++ b/sources/reactphysics3d/physics/Time.cpp
@@ -20,11 +20,16 @@
  // Libraries
  #include "Time.h"
 
- // We want to use the ReactPhysics3D namespace
- using namespace reactphysics3d;
+// We want to use the ReactPhysics3D namespace
+using namespace reactphysics3d;
 
- // Constructor
- Time::Time(double value) throw(std::invalid_argument) {
+// Constructor
+Time::Time() {
+    value = 0.0;
+}
+
+// Constructor with arguments
+Time::Time(double value) throw(std::invalid_argument) {
     // Check if the value is positive
     if (value >= 0.0) {
         this->value = value;
diff --git a/sources/reactphysics3d/physics/Time.h b/sources/reactphysics3d/physics/Time.h
index c8dc2210..71ebda2a 100644
--- a/sources/reactphysics3d/physics/Time.h
+++ b/sources/reactphysics3d/physics/Time.h
@@ -38,7 +38,8 @@ class Time {
         double value;                   // Time in seconds
 
     public :
-        Time(double value) throw(std::invalid_argument);                // Constructor
+        Time();                                                         // Constructor
+        Time(double value) throw(std::invalid_argument);                // Constructor with arguments
         Time(const Time& time);                                         // Copy-constructor
         virtual ~Time();                                                // Destructor
 
@@ -46,9 +47,9 @@ class Time {
         void setValue(double value) throw(std::invalid_argument) ;      // Set the time value
 
         // Overloaded operators
-        Time operator+(const Time& time2) const;                            // Overloaded operator for addition with Time
-        Time operator-(const Time& time2) const;                            // Overloaded operator for substraction with Time
-        Time operator*(double number) const throw(std::invalid_argument);   // Overloaded operator for multiplication with a number
+        Time operator+(const Time& time2) const;                                // Overloaded operator for addition with Time
+        Time operator-(const Time& time2) const throw(std::invalid_argument);   // Overloaded operator for substraction with Time
+        Time operator*(double number) const throw(std::invalid_argument);       // Overloaded operator for multiplication with a number
 };
 
 // --- Inlines functions --- //
@@ -79,8 +80,18 @@ inline Time Time::operator+(const Time& time2) const {
 }
 
 // Overloaded operator for substraction with Time
-inline Time Time::operator-(const Time& time2) const {
-    return Time(value - time2.value);
+inline Time Time::operator-(const Time& time2) const throw(std::invalid_argument) {
+    // Compute the result of the substraction
+    double result = value - time2.value;
+
+    // If the result is negative
+    if (result <= 0.0) {
+        // We throw an exception
+        throw std::invalid_argument("Exception in Time::operator- : The result should be positive");
+    }
+
+    // Return the result
+    return Time(result);
 }
 
 // Overloaded operator for multiplication with a number