Allow conversion of number to 32 bits integer

The method to_uint32() converts a number to a 32-bits-wide integer. The
function throws if number cannot be represented using only a single
32-bits-wide integer.

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

2 files changed, 18 insertions, 0 deletions

diff --git a/number.cpp b/number.cpp
index fcc6dc0..ae4b167 100644
--- a/number.cpp
+++ b/number.cpp
@@ -51,6 +51,16 @@ number::to_dec_string() const
     return ss.str();
 }
 
+std::uint32_t
+number::to_uint32() const
+{
+    if (*this > UINT32_MAX) {
+        throw std::out_of_range("> UINT32_MAX");
+    }
+
+    return (*this == 0) ? 0 : _operands.front();
+}
+
 /* }}} */
 /* Operations {{{ */
 
diff --git a/number.h b/number.h
index 189011d..d93ed70 100644
--- a/number.h
+++ b/number.h
@@ -26,6 +26,14 @@ public:
     std::string to_dec_string() const;
 
     /**
+     * \brief Return a 32-bits-wide integer that corresponds to this number.
+     *
+     * \throws std::out_of_range The number cannot be represented by a single
+     * 32-bits-wide integer.
+     */
+    std::uint32_t to_uint32() const;
+
+    /**
      * \brief Return the result of the addition of a number and this number.
      *
      * \param n The number to add to this number.