Added the conversion from number to 64 bits integer

Signed-off-by: Olivier Gayot <og@satcom1.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/number.cpp b/number.cpp
index 75fd0f8..d39ed36 100644
--- a/number.cpp
+++ b/number.cpp
@@ -70,6 +70,26 @@ number::to_uint32() const
     return (*this == 0) ? 0 : _operands.front();
 }
 
+std::uint64_t
+number::to_uint64() const
+{
+    auto size = _operands.size();
+
+    if (size > 2) {
+        throw std::out_of_range("> UINT64_MAX");
+    }
+
+    std::uint64_t result = 0;
+
+    for (auto it = _operands.crbegin(); it != _operands.crend(); ++it) {
+        result <<= 32;
+
+        result |= (*it);
+    }
+
+    return result;
+}
+
 number::operator bool() const
 {
     return *this != 0;
diff --git a/number.h b/number.h
index 337a47d..d0d2a10 100644
--- a/number.h
+++ b/number.h
@@ -35,6 +35,14 @@ public:
     std::uint32_t to_uint32() const;
 
     /**
+     * \brief Return a 64-bits-wide integer that corresponds to this number.
+     *
+     * \throws std::out_of_range The number cannot be represented by a single
+     * 64-bits-wide integer.
+     */
+    std::uint64_t to_uint64() const;
+
+    /**
      * \brief Return true if this number is not equal to 0. Otherwise, return
      * false.
      */