From 1ffa6e25baffae1a3becbe541c447dd3120cd627 Mon Sep 17 00:00:00 2001 From: rbock Date: Wed, 26 Mar 2014 21:02:22 +0100 Subject: [PATCH] Added an argument selector It returns the "correct" argument out of two. --- include/sqlpp11/detail/arg_selector.h | 47 +++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 include/sqlpp11/detail/arg_selector.h diff --git a/include/sqlpp11/detail/arg_selector.h b/include/sqlpp11/detail/arg_selector.h new file mode 100644 index 00000000..5332f33f --- /dev/null +++ b/include/sqlpp11/detail/arg_selector.h @@ -0,0 +1,47 @@ +/* + * Copyright (c) 2013, Roland Bock + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, this + * list of conditions and the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef SQLPP_DETAIL_ARG_SELECTOR_H +#define SQLPP_DETAIL_ARG_SELECTOR_H + +namespace sqlpp +{ + namespace detail + { + template + struct arg_selector + { + template + static Target _(X, Target t) { return t; } + + template + static Target _(Target t, X) { return t; } + }; + } +} + + +#endif