Add wxConfig::Read(float *) overload.

This uses Read(double *) but casts the result to float after checking that it
is in the correct range.

Closes #12100.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64428 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/config/fileconf.cpp

@@ -82,6 +82,7 @@ private:
         CPPUNIT_TEST( AddToExistingRoot );
         CPPUNIT_TEST( ReadNonExistent );
         CPPUNIT_TEST( ReadEmpty );
+        CPPUNIT_TEST( ReadFloat );
     CPPUNIT_TEST_SUITE_END();
 
     void Path();
@@ -105,6 +106,7 @@ private:
     void AddToExistingRoot();
     void ReadNonExistent();
     void ReadEmpty();
+    void ReadFloat();
 
 
     static wxString ChangePath(wxFileConfig& fc, const wxChar *path)
@@ -659,5 +661,24 @@ void FileConfigTestCase::ReadEmpty()
     wxFileConfig fc(sis);
 }
 
+void FileConfigTestCase::ReadFloat()
+{
+    static const char *confTest =
+        "x=1.234\n"
+        "y=-9876.5432\n"
+        "z=2e+308\n"
+    ;
+
+    wxStringInputStream sis(confTest);
+    wxFileConfig fc(sis);
+
+    float f;
+    CPPUNIT_ASSERT( fc.Read("x", &f) );
+    CPPUNIT_ASSERT_EQUAL( 1.234f, f );
+
+    CPPUNIT_ASSERT( fc.Read("y", &f) );
+    CPPUNIT_ASSERT_EQUAL( -9876.5432f, f );
+}
+
 #endif // wxUSE_FILECONFIG