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cpp_redis/includes/cpp_redis/helpers/variadic_template.hpp at master · cpp-redis/cpp_redis · GitHub
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variadic_template.hpp
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//
The MIT License (MIT)
//
//
Copyright (c) 2015-2017 Simon Ninon <simon.ninon@gmail.com>
//
//
Permission is hereby granted, free of charge, to any person obtaining a copy
//
of this software and associated documentation files (the "Software"), to deal
//
in the Software without restriction, including without limitation the rights
//
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//
copies of the Software, and to permit persons to whom the Software is
//
furnished to do so, subject to the following conditions:
//
//
The above copyright notice and this permission notice shall be included in all
//
copies or substantial portions of the Software.
//
//
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//
SOFTWARE.
#
pragma
once
#
include
<
type_traits
>
namespace
cpp_redis
{
namespace
helpers
{
/*
*
* type traits to return last element of a variadic list
*
*/
template
<
typename
T,
typename
... Args>
struct
back
{
/*
*
* last type of variadic list
*
*/
using
type =
typename
back<Args...>::type;
};
/*
*
* type traits to return last element of a variadic list
*
*/
template
<
typename
T>
struct
back
<T> {
/*
*
* templated type
*
*/
using
type = T;
};
/*
*
* type traits to return front element of a variadic list
*
*/
template
<
typename
T,
typename
... Ts>
struct
front
{
/*
*
* front type of variadic list
*
*/
using
type = T;
};
/*
*
* type traits to check if type is present in variadic list
*
*/
template
<
typename
T1
,
typename
T2
,
typename
... Ts>
struct
is_type_present
{
/*
*
* true if T1 is present in remaining types of variadic list
* false otherwise
*
*/
static
constexpr
bool
value = std::is_same<
T1
,
T2
>::value
?
true
: is_type_present<
T1
, Ts...>::value;
};
/*
*
* type traits to check if type is present in variadic list
*
*/
template
<
typename
T1
,
typename
T2
>
struct
is_type_present
<
T1
,
T2
> {
/*
*
* true if T1 and T2 are the same
* false otherwise
*
*/
static
constexpr
bool
value = std::is_same<
T1
,
T2
>::value;
};
/*
*
* type traits to check if type is not present in variadic list
*
*/
template
<
typename
T,
typename
... Args>
struct
is_different_types
{
/*
*
* true if T is not in remaining types of variadic list
* false otherwise
*
*/
static
constexpr
bool
value = is_type_present<T, Args...>::value
?
false
: is_different_types<Args...>::value;
};
/*
*
* type traits to check if type is not present in variadic list
*
*/
template
<
typename
T1
>
struct
is_different_types
<
T1
> {
/*
*
* true
*
*/
static
constexpr
bool
value =
true
;
};
}
//
namespace helpers
}
//
namespace cpp_redis
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