Synopsis

stdext:: offers a set of functionalities built upon the ones that can be found in the Standard Template Library.

This library is a work in progress project.
New functionalities will be added whenever:

• I need them and I find the time to correctly define them
• Someone asks for them with a ticket (I'll try to updated the project as soon as possible)
• A PR is sent and it contains code, tests and documentation as well

Code Example

Examples of the above mentioned functionalities are:

• are_same

  struct S { };
  struct T { };
  static_assert(not are_same<S, T, S>::value, "are not all the same")
  

• is_base_of_all

  struct B { };
  struct D: B { };
  struct C: B { };
  static_assert(is_base_of_all<B, D, C>::value, "B is base of D and C")
  

• tail

  std::tuple<int, double> tup{};
  auto t = tail(tup);
  assert((std::is_same<decltype(t), std::tuple<double>>::value));
  

Motivation

The Standard Template Library contains a lot of facilities, but it also lacks a lot of other useful tools.
stdext:: tries to fill the gap, offering those utilities that are not part of the Standard Template Library.

Installation

The stdext:: library is a header only library.
Because of that, a user is demanded simply to include it and all the functionalities will be available at once.
Please, note that all the types are part of the stdext namespace.
See the files in src for further details.

API Reference

The documentation is available by means of cmake.
Be sure to have doxygen installed and use the following commands:

cd build
cmake ..
make docs

It will be created in build/docs/html.
One can simply open the file index.html and navigate it.

List of currently available facilities and classes.

Tuple

• tail

  template<typename H, typename... T>
  constexpr std::tuple<T...> tail(std::tuple<H, T...> &tup);
  
  template<typename H, typename... T>
  constexpr std::tuple<T...> tail(std::tuple<H, T...> &&tup);
  

• invoke

  template<typename F, typename... T>
  constexpr auto invoke(F &&f, std::tuple<T...> &tup);
  

Type Traits

Primary type categories

• are_void
• are_null_pointer
• are_integral
• are_floating_point
• are_array
• are_enum
• are_union
• are_class
• are_function
• are_pointer
• are_lvalue_reference
• are_rvalue_reference
• are_member_object_pointer
• are_member_function_pointer

Composite type categories

• are_fundamental
• are_arithmetic
• are_scalar
• are_object
• are_compound
• are_reference
• are_member_pointer

Type properties

• are_const
• are_volatile
• are_trivial
• are_trivially_copyable
• are_standard_layout
• are_pod
• are_literal_type
• are_empty
• are_polymorphic
• are_abstract
• are_signed
• are_unsigned

Supported operations

• are_constructible
• are_trivially_constructible
• are_nothrow_constructible
• are_default_constructible
• are_trivially_default_constructible
• are_nothrow_default_constructible
• are_copy_constructible
• are_trivially_copy_constructible
• are_nothrow_copy_constructible
• are_move_constructible
• are_trivially_move_constructible
• are_nothrow_move_constructible

Type relationships

• is_same_of_any
• is_same_of_all
• are_all_same_of
• is_base_of_any
• is_base_of_all
• are_all_base_of
• is_convertible_to_any
• is_convertible_to_all
• are_all_convertible_to

Please, note that all the types above mentioned are provided along with their helper variable templates, similar to the ones available in the Standard Template Library (mostly since C++17).
As an example, the helper variable template for the is_same_of_any type is defined as:

template<class... A>
constexpr bool is_same_of_any_v = is_same_of_any<A...>::value;

More in general, all those helpers are defined as:

template<class... A>
constexpr bool actual_type_name_v = actual_type_name<A...>::value;

Utility

• function_proxy

  std::is_same<
      typename function_proxy<1, void(int, char, double)>::type,
      std::function<void(int)>
  >::value;
  

• inherit_from

  std::is_same<
      inherit_from_t<const int ** const &&, char>,
      types<int, const char ** const &&>
  >::value
  
  std::is_same<
      inherit_from_basic_t<int const **[][3][5], double>,
      int
  >::value
  
  std::is_same<
      inherit_from_decorated_t<int const **[][3][5], double>,
      double const **[][3][5]
  >::value
  

Please, note that all the types above mentioned are provided along with their helper type templates, similar to the ones available in the Standard Template Library (mostly since C++14).
As an example, the helper variable template for the function_proxy type is defined as:

template<std::size_t N, typename F>
using function_proxy_t = typename function_proxy<N, F>::type;

More in general, all those helpers are defined as:

template<class... A>
using actual_type_name_t = typename actual_type_name<A...>::type;

Tests

Building in-tree is not allowed, so you should compile them in the build directory before to launch them.
To do that, you can simply execute the following commands:

cd build
cmake ..
make
make test

Contributors

Michele Caini (skypjack)

License

The MIT License (MIT)

Copyright © 2016 Michele Caini

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.