C++14 and later CRTP templates for defining iterators, views, and containers
An updated C++20-friendly version of the iterator_facade
and
iterator_adaptor
parts of Boost.Iterator (now called iterator_interface
);
a pre-C++20 version of C++20's view_interface
; and a new template called
container_interface
, meant to aid the creation of new containers; all
targeting standardization. This library requires at least C++14.
For the iterator portion -- if you need to write an iterator, iterator_interface
turns this:
struct repeated_chars_iterator
{
using value_type = char;
using difference_type = std::ptrdiff_t;
using pointer = char const *;
using reference = char const;
using iterator_category = std::random_access_iterator_tag;
constexpr repeated_chars_iterator() noexcept :
first_(nullptr),
size_(0),
n_(0)
{}
constexpr repeated_chars_iterator(
char const * first,
difference_type size,
difference_type n) noexcept :
first_(first),
size_(size),
n_(n)
{}
constexpr reference operator*() const noexcept
{
return first_[n_ % size_];
}
constexpr value_type operator[](difference_type n) const noexcept
{
return first_[(n_ + n) % size_];
}
constexpr repeated_chars_iterator & operator++() noexcept
{
++n_;
return *this;
}
constexpr repeated_chars_iterator operator++(int)noexcept
{
repeated_chars_iterator retval = *this;
++*this;
return retval;
}
constexpr repeated_chars_iterator & operator+=(difference_type n) noexcept
{
n_ += n;
return *this;
}
constexpr repeated_chars_iterator & operator--() noexcept
{
--n_;
return *this;
}
constexpr repeated_chars_iterator operator--(int)noexcept
{
repeated_chars_iterator retval = *this;
--*this;
return retval;
}
constexpr repeated_chars_iterator & operator-=(difference_type n) noexcept
{
n_ -= n;
return *this;
}
friend constexpr bool operator==(
repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
{
return lhs.first_ == rhs.first_ && lhs.n_ == rhs.n_;
}
friend constexpr bool operator!=(
repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
{
return !(lhs == rhs);
}
friend constexpr bool operator<(
repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
{
return lhs.first_ == rhs.first_ && lhs.n_ < rhs.n_;
}
friend constexpr bool operator<=(
repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
{
return lhs == rhs || lhs < rhs;
}
friend constexpr bool operator>(
repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
{
return rhs < lhs;
}
friend constexpr bool operator>=(
repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
{
return rhs <= lhs;
}
friend constexpr repeated_chars_iterator
operator+(repeated_chars_iterator lhs, difference_type rhs) noexcept
{
return lhs += rhs;
}
friend constexpr repeated_chars_iterator
operator+(difference_type lhs, repeated_chars_iterator rhs) noexcept
{
return rhs += lhs;
}
friend constexpr repeated_chars_iterator
operator-(repeated_chars_iterator lhs, difference_type rhs) noexcept
{
return lhs -= rhs;
}
friend constexpr difference_type operator-(
repeated_chars_iterator lhs, repeated_chars_iterator rhs) noexcept
{
return lhs.n_ - rhs.n_;
}
private:
char const * first_;
difference_type size_;
difference_type n_;
};
into this:
struct repeated_chars_iterator : boost::stl_interfaces::iterator_interface<
repeated_chars_iterator,
std::random_access_iterator_tag,
char,
char>
{
constexpr repeated_chars_iterator() noexcept :
first_(nullptr),
size_(0),
n_(0)
{}
constexpr repeated_chars_iterator(
char const * first, difference_type size, difference_type n) noexcept :
first_(first),
size_(size),
n_(n)
{}
constexpr char operator*() const noexcept { return first_[n_ % size_]; }
constexpr repeated_chars_iterator & operator+=(std::ptrdiff_t i) noexcept
{
n_ += i;
return *this;
}
constexpr auto operator-(repeated_chars_iterator other) const noexcept
{
return n_ - other.n_;
}
private:
char const * first_;
difference_type size_;
difference_type n_;
};
The code size savings are even more dramatic for view_interface
and
container_interface
! If you don't ever write iterators, range views, or
containers, this is not for you.
Online docs: https://boostorg.github.io/stl_interfaces.
This library includes a temporary implementation for those who wish to experiment with
a concept-constrained version before C++20 is widely implemented. Casey Carter's cmcstl2
is an implementation of the std::ranges
portion of the C++20 standard library. To use it:
-
check out the cmcstl2 branch of this library; then
-
put its headers in your include path, so that they can be included with
#include <stl2/foo.hpp>
; and -
build with GCC 8 or 9, including the
-fconcepts
and-std=c++2a
flags.
GCC 8 and 9 are the only compilers with an adequate concepts implementation at the time of this writing.
version | 1.78.0 |
---|---|
license | BSL-1.0Boost Software License 1.0 |
repository | https://pkg.cppget.org/1/stable |
download | libboost-stl-interfaces-1.78.0.tar.gz |
sha256 | f7e7086d3a7d04ac4ad0aa5e000e521274fd2efafdde9acd8854f00724e73e94 |
project | boost |
---|---|
url | github.com/boostorg/stl_interfaces |
doc-url | www.boost.org/doc/libs/1_78_0/libs/stl_interfaces |
package-url | github.com/build2-packaging/boost |
boost-users@lists.boost.orgMailing list | |
package-email | packaging@build2.orgMailing list |
topics | C++Boost |
Depends (2)
libboost-assert == 1.78.0 | |
libboost-config == 1.78.0 |
Builds
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_11-gcc_12 |
timestamp | 2024-05-04 12:13:17 UTC (21:03:58 hours ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_14.0-static_O3 |
timestamp | 2024-05-04 11:04:03 UTC (22:13:12 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_14.0-O3 |
timestamp | 2024-05-04 11:03:22 UTC (22:13:53 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_14.0 |
timestamp | 2024-05-04 11:02:40 UTC (22:14:35 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-gcc_13-static_O3 |
timestamp | 2024-05-04 10:34:25 UTC (22:42:50 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-gcc_13-O3 |
timestamp | 2024-05-04 10:32:26 UTC (22:44:49 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-gcc_13-ndebug_O3 |
timestamp | 2024-05-04 10:31:50 UTC (22:45:25 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-gcc_13 |
timestamp | 2024-05-04 10:31:23 UTC (22:45:52 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_15_libc++ |
timestamp | 2024-05-04 10:23:35 UTC (22:53:40 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_15 |
timestamp | 2024-05-04 10:22:58 UTC (22:54:17 hours ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_fedora_37-gcc_12.2-bindist |
timestamp | 2024-05-04 01:05:10 UTC (01 08:12:05 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16_libc++-O3 |
timestamp | 2024-05-03 19:49:49 UTC (01 13:27:26 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16_libc++-static_O3 |
timestamp | 2024-05-03 19:43:55 UTC (01 13:33:20 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16_libc++ |
timestamp | 2024-05-03 19:33:14 UTC (01 13:44:01 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_15.0-static_O3 |
timestamp | 2024-05-03 16:39:52 UTC (01 16:37:23 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_15.0-O3 |
timestamp | 2024-05-03 16:39:10 UTC (01 16:38:05 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-apple-darwin22.5.0 |
tgt config | macos_13-clang_15.0 |
timestamp | 2024-05-03 16:38:32 UTC (01 16:38:43 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0_libc++-static_O3 |
timestamp | 2024-05-03 13:59:54 UTC (01 19:17:21 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0_libc++-O3 |
timestamp | 2024-05-03 13:58:31 UTC (01 19:18:44 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0_libc++ |
timestamp | 2024-05-03 13:58:20 UTC (01 19:18:55 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_12-bindist |
timestamp | 2024-05-03 13:47:10 UTC (01 19:30:05 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-clang_16.0_llvm_msvc_17.6 |
timestamp | 2024-05-03 13:45:03 UTC (01 19:32:12 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-clang_16.0_llvm_msvc_17.6-O2 |
timestamp | 2024-05-03 13:43:15 UTC (01 19:34:00 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-clang_16.0_llvm_msvc_17.6-static_O2 |
timestamp | 2024-05-03 13:42:53 UTC (01 19:34:22 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-msvc_17.6-static_O2 |
timestamp | 2024-05-03 13:00:48 UTC (01 20:16:27 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-msvc_17.6-O2 |
timestamp | 2024-05-03 13:00:04 UTC (01 20:17:11 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-msvc_17.6 |
timestamp | 2024-05-03 13:00:00 UTC (01 20:17:15 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-w64-mingw32 |
tgt config | windows_10-gcc_12.2_mingw_w64-static_O2 |
timestamp | 2024-05-03 12:59:25 UTC (01 20:17:50 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-w64-mingw32 |
tgt config | windows_10-gcc_12.2_mingw_w64 |
timestamp | 2024-05-03 12:58:43 UTC (01 20:18:32 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-w64-mingw32 |
tgt config | windows_10-gcc_12.2_mingw_w64-O2 |
timestamp | 2024-05-03 12:55:59 UTC (01 20:21:16 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-msvc_17.5 |
timestamp | 2024-05-03 12:34:43 UTC (01 20:42:32 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_11-gcc_12.1 |
timestamp | 2024-05-03 12:22:14 UTC (01 20:55:01 days ago) |
result | success | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16-static_O3 |
timestamp | 2024-05-03 10:59:29 UTC (01 22:17:46 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16-O3 |
timestamp | 2024-05-03 10:58:54 UTC (01 22:18:21 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | aarch64-linux-gnu |
tgt config | linux_debian_12-clang_16 |
timestamp | 2024-05-03 10:58:19 UTC (01 22:18:56 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-microsoft-win32-msvc14.3 |
tgt config | windows_10-clang_15.0_msvc_msvc_17.6 |
timestamp | 2024-05-03 10:53:43 UTC (01 22:23:32 days ago) |
result | warning (update) | warning (test-installed) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_fedora_38-gcc_13-bindist |
timestamp | 2024-05-03 10:53:30 UTC (01 22:23:45 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0-static_O3 |
timestamp | 2024-05-03 10:38:44 UTC (01 22:38:31 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0 |
timestamp | 2024-05-03 10:38:44 UTC (01 22:38:31 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_16.0-O3 |
timestamp | 2024-05-03 10:38:14 UTC (01 22:39:01 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_13.1-O3 |
timestamp | 2024-05-03 10:27:51 UTC (01 22:49:24 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-freebsd13.2 |
tgt config | freebsd_13-clang_14.0-static_O3 |
timestamp | 2024-05-03 10:27:32 UTC (01 22:49:43 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_13.1 |
timestamp | 2024-05-03 10:27:19 UTC (01 22:49:56 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_13.1-ndebug_O3 |
timestamp | 2024-05-03 10:27:15 UTC (01 22:49:59 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-freebsd13.2 |
tgt config | freebsd_13-clang_14.0 |
timestamp | 2024-05-03 10:26:54 UTC (01 22:50:21 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-gcc_13.1-static_O3 |
timestamp | 2024-05-03 10:26:34 UTC (01 22:50:41 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_15.0 |
timestamp | 2024-05-03 10:26:07 UTC (01 22:51:08 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-freebsd13.2 |
tgt config | freebsd_13-clang_14.0-O3 |
timestamp | 2024-05-03 10:25:52 UTC (01 22:51:23 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-linux-gnu |
tgt config | linux_debian_12-clang_15.0_libc++ |
timestamp | 2024-05-03 10:25:42 UTC (01 22:51:33 days ago) |
result | error (update) | log | rebuild |
toolchain | public-0.16.0 |
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target | x86_64-freebsd12.4 |
tgt config | freebsd_12-clang_13.0 |
timestamp | 2024-05-03 10:25:23 UTC (01 22:51:52 days ago) |
result | error (update) | log | rebuild |
target | x86_64-apple-darwin22.5.0 |
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tgt config | macos_13-gcc_13_homebrew |
result | excluded (https://github) |
target | x86_64-apple-darwin22.5.0 |
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tgt config | macos_13-gcc_13_homebrew-O3 |
result | excluded (https://github) |
target | x86_64-apple-darwin22.5.0 |
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tgt config | macos_13-gcc_13_homebrew-static_O3 |
result | excluded (https://github) |