mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-22 12:51:42 +03:00
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
|
/// @file
|
||
|
|
// Copyright (c) 2009-2016 Vladimir Batov.
|
||
|
|
// Use, modification and distribution are subject to the Boost Software License,
|
||
|
|
// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
|
||
|
|
|
||
|
|
#ifndef BOOST_MAKE_DEFAULT_HPP
|
||
|
|
#define BOOST_MAKE_DEFAULT_HPP
|
||
|
|
|
||
|
|
namespace boost
|
||
|
|
{
|
||
|
|
/// @details A considerable number of libraries require an instance of a class
|
||
|
|
/// provided (storage created and initialized). For example,
|
||
|
|
/// @code
|
||
|
|
/// Type result;
|
||
|
|
/// ...
|
||
|
|
/// istream >> result;
|
||
|
|
/// @endcode
|
||
|
|
/// In generic code that results in the Default Constructibility requirement imposed
|
||
|
|
/// on every type 'Type' to be used with the respective code. Inevitably, that requirement
|
||
|
|
/// a) either excludes all the classes that for various reasons do not meet that requirement or
|
||
|
|
/// b) imposes certain (not necessarily desirable) design/implementation onto respective classes.
|
||
|
|
///
|
||
|
|
/// Deployment of boost::make_default() eliminates the Default Constructibility requirement with
|
||
|
|
/// @code
|
||
|
|
/// Type result = boost::make_default<Type>();
|
||
|
|
/// ...
|
||
|
|
/// istream >> result;
|
||
|
|
/// @endcode
|
||
|
|
/// Classes with no default constructor can now be included via a boost::make_default() specialization:
|
||
|
|
/// @code
|
||
|
|
/// namespace boost
|
||
|
|
/// {
|
||
|
|
/// template<> inline Type make_default<Type>() { return Type(parameters); }
|
||
|
|
/// }
|
||
|
|
/// @endcode
|
||
|
|
|
||
|
|
template<typename T> T make_default() { return T(); }
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // BOOST_MAKE_DEFAULT_HPP
|