From add989703e694f7719e015cc12717d9953de0322 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Sun, 17 Nov 2013 22:34:23 +0100
Subject: [PATCH] Math: don't allow *::data() to be called on rvalues.

There are more cases that should be fixed, but this is the most
problematic one, as this might look completely innocent:

    Vector2 a, b;
    float* c = (a + b).data();

Unlike this, which looks suspicious:

    Vector2& c = a + b;
---
 src/Math/RectangularMatrix.h | 16 ++++++++++++++--
 src/Math/Vector.h            | 16 ++++++++++++++--
 2 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/src/Math/RectangularMatrix.h b/src/Math/RectangularMatrix.h
index cbb0a685f..89b365c56 100644
--- a/src/Math/RectangularMatrix.h
+++ b/src/Math/RectangularMatrix.h
@@ -164,8 +164,20 @@ template<std::size_t cols, std::size_t rows, class T> class RectangularMatrix {
          *
          * @see operator[]
          */
-        T* data() { return _data[0].data(); }
-        constexpr const T* data() const { return _data[0].data(); } /**< @overload */
+        T* data()
+        #ifndef CORRADE_GCC47_COMPATIBILITY
+        &
+        #endif
+        { return _data[0].data(); }
+
+        /** @overload */
+        constexpr const T* data()
+        #ifndef CORRADE_GCC47_COMPATIBILITY
+        const &
+        #else
+        const
+        #endif
+        { return _data[0].data(); }
 
         /**
          * @brief %Matrix column
diff --git a/src/Math/Vector.h b/src/Math/Vector.h
index 645b1b256..de6c77881 100644
--- a/src/Math/Vector.h
+++ b/src/Math/Vector.h
@@ -184,8 +184,20 @@ template<std::size_t size, class T> class Vector {
          *
          * @see operator[]()
          */
-        T* data() { return _data; }
-        constexpr const T* data() const { return _data; } /**< @overload */
+        T* data()
+        #ifndef CORRADE_GCC47_COMPATIBILITY
+        &
+        #endif
+        { return _data; }
+
+        /** @overload */
+        constexpr const T* data()
+        #ifndef CORRADE_GCC47_COMPATIBILITY
+        const &
+        #else
+        const
+        #endif
+        { return _data; }
 
         /**
          * @brief Value at given position