Refactor stream write functionality into a standalone utility

Make string_view operator<< use rdbuf directly

.travis.yml

@@ -88,6 +88,17 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
 
+    - os: linux
+      dist: trusty
+      compiler: g++-8
+      env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17
+      addons:
+        apt:
+          packages:
+            - g++-8
+          sources:
+            - ubuntu-toolchain-r-test
+
     - os: linux
       compiler: clang++
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
@@ -175,23 +186,55 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-trusty-5.0
 
+    - os: linux
+      compiler: clang++-6.0
+      env: TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=03,11,14,17
+      addons:
+        apt:
+          packages:
+            - clang-6.0
+            - libstdc++-5-dev
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty-6.0
+
+    - os: linux
+      compiler: clang++-7
+      env: TOOLSET=clang COMPILER=clang++-7 CXXSTD=03,11,14,17
+      addons:
+        apt:
+          packages:
+            - clang-7
+            - libstdc++-5-dev
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty-7
+
     - os: osx
       compiler: clang++
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
 
 install:
-  - BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true
+  - GIT_FETCH_JOBS=8
+  - BOOST_BRANCH=develop
+  - if [ "$TRAVIS_BRANCH" = "master" ]; then BOOST_BRANCH=master; fi
   - cd ..
   - git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
   - cd boost-root
-  - git submodule update --init tools/build
+  - git submodule init tools/build
-  - git submodule update --init libs/assert
+  - git submodule init tools/boost_install
-  - git submodule update --init libs/config
+  - git submodule init libs/headers
-  - git submodule update --init libs/core
+  - git submodule init libs/assert
-  - git submodule update --init libs/preprocessor
+  - git submodule init libs/config
-  - git submodule update --init libs/static_assert
+  - git submodule init libs/core
-  - git submodule update --init libs/throw_exception
+  - git submodule init libs/preprocessor
-  - git submodule update --init libs/type_traits
+  - git submodule init libs/static_assert
+  - git submodule init libs/throw_exception
+  - git submodule init libs/type_traits
+  - git submodule init libs/container_hash
+  - git submodule init libs/integer
+  - git submodule init libs/detail
+  - git submodule update --jobs $GIT_FETCH_JOBS
   - cp -r $TRAVIS_BUILD_DIR/* libs/utility
   - ./bootstrap.sh
   - ./b2 headers
@@ -199,7 +242,8 @@ install:
 script:
   - |-
     echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
-  - ./b2 -j3 libs/utility/test toolset=$TOOLSET cxxstd=$CXXSTD
+  - BUILD_JOBS=`(nproc || sysctl -n hw.ncpu) 2> /dev/null`
+  - ./b2 -j $BUILD_JOBS libs/utility/test toolset=$TOOLSET cxxstd=$CXXSTD
 
 notifications:
   email:

CMakeLists.txt

@@ -0,0 +1,27 @@
+# Copyright 2018 Peter Dimov
+# Copyright 2018 Andrey Semashev
+# Distributed under the Boost Software License, Version 1.0.
+# See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
+
+# Partial (add_subdirectory only) and experimental CMake support
+# Subject to change; please do not rely on the contents of this file yet.
+
+cmake_minimum_required(VERSION 3.5)
+
+project(BoostUtility LANGUAGES CXX)
+
+add_library(boost_utility INTERFACE)
+add_library(Boost::utility ALIAS boost_utility)
+
+target_include_directories(boost_utility INTERFACE include)
+
+target_link_libraries(boost_utility
+    INTERFACE
+        Boost::config
+        Boost::container_hash
+        Boost::core
+        Boost::preprocessor
+        Boost::static_assert
+        Boost::throw_exception
+        Boost::type_traits
+)

README.md

@@ -0,0 +1,24 @@
+# ![Boost.Utility](doc/logo.png)
+
+Boost.Utility, part of collection of the [Boost C++ Libraries](https://github.com/boostorg), provides a number of smaller components, too small to be called libraries in their own right. See the documentation for the list of components.
+
+### Directories
+
+* **doc** - Documentation sources
+* **include** - Interface headers of Boost.Utility
+* **test** - Boost.Utility unit tests
+
+### More information
+
+* [Documentation](https://boost.org/libs/utility)
+* [Report bugs](https://github.com/boostorg/utility/issues/new). Be sure to mention Boost version, Boost.Utility component, platform and compiler you're using. A small compilable code sample to reproduce the problem is always good as well.
+* Submit your patches as pull requests against **develop** branch. Note that by submitting patches you agree to license your modifications under the [Boost Software License, Version 1.0](https://www.boost.org/LICENSE_1_0.txt).
+
+### Build status
+
+Master: [![Travis CI](https://travis-ci.org/boostorg/utility.svg?branch=master)](https://travis-ci.org/boostorg/utility)
+Develop: [![Travis CI](https://travis-ci.org/boostorg/utility.svg?branch=develop)](https://travis-ci.org/boostorg/utility)
+
+### License
+
+Distributed under the [Boost Software License, Version 1.0](https://www.boost.org/LICENSE_1_0.txt).

appveyor.yml

@@ -1,4 +1,4 @@
-# Copyright 2016, 2017 Peter Dimov
+# Copyright 2016-2019 Peter Dimov
 # Distributed under the Boost Software License, Version 1.0.
 # (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
 
@@ -14,29 +14,38 @@ branches:
 
 environment:
   matrix:
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
-      TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0,msvc-12.0
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      TOOLSET: msvc-14.0
+      TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      TOOLSET: msvc-12.0,msvc-14.0
+      ADDRMD: 32,64
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       TOOLSET: msvc-14.1
+      ADDRMD: 32,64
       CXXSTD: 14,17
 
 install:
+  - set GIT_FETCH_JOBS=8
   - set BOOST_BRANCH=develop
   - if "%APPVEYOR_REPO_BRANCH%" == "master" set BOOST_BRANCH=master
   - cd ..
   - git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
   - cd boost-root
-  - git submodule update --init tools/build
+  - git submodule init tools/build
-  - git submodule update --init libs/assert
+  - git submodule init tools/boost_install
-  - git submodule update --init libs/config
+  - git submodule init libs/headers
-  - git submodule update --init libs/core
+  - git submodule init libs/assert
-  - git submodule update --init libs/preprocessor
+  - git submodule init libs/config
-  - git submodule update --init libs/static_assert
+  - git submodule init libs/core
-  - git submodule update --init libs/throw_exception
+  - git submodule init libs/preprocessor
-  - git submodule update --init libs/type_traits
+  - git submodule init libs/static_assert
-  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\utility
+  - git submodule init libs/throw_exception
+  - git submodule init libs/type_traits
+  - git submodule init libs/container_hash
+  - git submodule init libs/integer
+  - git submodule init libs/detail
+  - git submodule update --jobs %GIT_FETCH_JOBS%
+  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\utility\
   - cmd /c bootstrap
   - b2 -d0 headers
 
@@ -45,4 +54,5 @@ build: off
 test_script:
   - PATH=%ADDPATH%%PATH%
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
-  - b2 -j3 libs/utility/test toolset=%TOOLSET% %CXXSTD%
+  - if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
+  - b2 -j %NUMBER_OF_PROCESSORS% libs/utility/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release

call_traits.htm

@@ -493,7 +493,7 @@ call_traits can not be used with reference or array types.</p>
 <h4>Example 1:</h4>
 
 <p>The following class is a trivial class that stores some type T
-by value (see the <a href="call_traits_test.cpp">call_traits_test.cpp</a>
+by value (see the <a href="test/call_traits_test.cpp">call_traits_test.cpp</a>
 file), the aim is to illustrate how each of the available
 call_traits typedefs may be used:</p>
 

doc/Jamfile.v2

@@ -99,6 +99,19 @@ boostbook standalone_declval
         <xsl:param>generate.section.toc.level=1
      ;
 
+xml ostream_string : ostream_string.qbk ;
+boostbook standalone_ostream_string
+    :
+        ostream_string
+    :
+        <xsl:param>root.filename=ostream_string
+        <xsl:param>chunk.section.depth=0
+        <xsl:param>chunk.first.sections=0
+        <xsl:param>toc.section.depth=1
+        <xsl:param>toc.max.depth=1
+        <xsl:param>generate.section.toc.level=1
+     ;
+
 xml string_ref : string_ref.qbk ;
 boostbook standalone_string_ref
     :
@@ -123,5 +136,5 @@ alias boostdoc ;
 explicit boostdoc ;
 alias boostrelease :
     standalone_base_from_member standalone_compressed_pair
-    standalone_declval standalone_string_ref ;
+    standalone_declval standalone_ostream_string standalone_string_ref ;
 explicit boostrelease ;

doc/base_from_member.qbk

@@ -356,7 +356,7 @@ templates that can be controlled and automated with macros. The
 implementation uses the [@../../../preprocessor/index.html Preprocessor library].
 
 * [@http://www.boost.org/people/daryle_walker.html">Daryle Walker] started the
-library. Contributed the test file [@../../base_from_member_test.cpp
+library. Contributed the test file [@../../test/base_from_member_test.cpp
 base_from_member_test.cpp].
 
 [endsect]

doc/logo.svg

@@ -0,0 +1,539 @@
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doc/ostream_string.qbk

@@ -0,0 +1,62 @@
+[/
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+]
+
+[article ostream_string
+[quickbook 1.5]
+[authors [Fernandes, Glen]]
+[copyright 2019 Glen Joseph Fernandes]
+[license Distributed under the Boost Software License, Version 1.0.]]
+
+[section Overview]
+
+The header <boost/utility/ostream_string.hpp> provides the function template
+boost::ostream_string for formatted output that satisfies the requirements of
+\[ostream.formatted.reqmts\].
+
+[endsect]
+
+[section Examples]
+
+The inserter for class template `basic_string_view` could be implemented as
+follows:
+
+```
+template<class charT, class traits>
+std::basic_ostream<charT, traits>&
+operator<<(std::basic_ostream<charT, traits>& os,
+    const basic_string_view<charT, traits>& str)
+{
+    return boost::ostream_string(os, str.data(), str.size());
+}
+```
+
+[endsect]
+
+[section Reference]
+
+```
+namespace boost {
+
+template<class charT, class traits>
+std::basic_ostream<charT, traits>&
+ostream_string(std::basic_ostream<charT, traits>& os,
+    const charT* data, std::size_t size);
+
+} /* boost */
+```
+
+[variablelist
+[[Effects]
+[Behaves like a formatted inserter (as described in
+\[ostream.formatted.reqmts\]) of `os`. Creates a character sequence `seq` of
+`size` characters starting at `data`, each widened using `os.widen()`
+(\[basic.ios.members\]). Determines padding for `seq` as described in
+\[ostream.formatted.reqmts\]. Inserts `seq` into `os`. Calls `width(0)`.]]
+[[Returns] [`os`.]]]
+
+[endsect]

include/boost/detail/compressed_pair.hpp

@@ -24,6 +24,7 @@
 
 #include <boost/type_traits/remove_cv.hpp>
 #include <boost/type_traits/is_empty.hpp>
+#include <boost/type_traits/is_final.hpp>
 #include <boost/type_traits/is_same.hpp>
 #include <boost/call_traits.hpp>
 
@@ -42,6 +43,14 @@ class compressed_pair;
 
 namespace details
 {
+   template<class T, bool E = boost::is_final<T>::value>
+   struct compressed_pair_empty
+      : ::boost::false_type { };
+
+   template<class T>
+   struct compressed_pair_empty<T, false>
+      : ::boost::is_empty<T> { };
+
    // JM altered 26 Jan 2000:
    template <class T1, class T2, bool IsSame, bool FirstEmpty, bool SecondEmpty>
    struct compressed_pair_switch;
@@ -343,8 +352,8 @@ class compressed_pair
                     T1,
                     T2,
                     ::boost::is_same<typename remove_cv<T1>::type, typename remove_cv<T2>::type>::value,
-                    ::boost::is_empty<T1>::value,
+                    ::boost::details::compressed_pair_empty<T1>::value,
-                    ::boost::is_empty<T2>::value>::value>
+                    ::boost::details::compressed_pair_empty<T2>::value>::value>
 {
 private:
    typedef details::compressed_pair_imp<T1, T2,
@@ -352,8 +361,8 @@ private:
                     T1,
                     T2,
                     ::boost::is_same<typename remove_cv<T1>::type, typename remove_cv<T2>::type>::value,
-                    ::boost::is_empty<T1>::value,
+                    ::boost::details::compressed_pair_empty<T1>::value,
-                    ::boost::is_empty<T2>::value>::value> base;
+                    ::boost::details::compressed_pair_empty<T2>::value>::value> base;
 public:
    typedef T1                                                 first_type;
    typedef T2                                                 second_type;
@@ -388,8 +397,8 @@ class compressed_pair<T, T>
                     T,
                     T,
                     ::boost::is_same<typename remove_cv<T>::type, typename remove_cv<T>::type>::value,
-                    ::boost::is_empty<T>::value,
+                    ::boost::details::compressed_pair_empty<T>::value,
-                    ::boost::is_empty<T>::value>::value>
+                    ::boost::details::compressed_pair_empty<T>::value>::value>
 {
 private:
    typedef details::compressed_pair_imp<T, T,
@@ -397,8 +406,8 @@ private:
                     T,
                     T,
                     ::boost::is_same<typename remove_cv<T>::type, typename remove_cv<T>::type>::value,
-                    ::boost::is_empty<T>::value,
+                    ::boost::details::compressed_pair_empty<T>::value,
-                    ::boost::is_empty<T>::value>::value> base;
+                    ::boost::details::compressed_pair_empty<T>::value>::value> base;
 public:
    typedef T                                                  first_type;
    typedef T                                                  second_type;

include/boost/utility/ostream_string.hpp

@@ -0,0 +1,95 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_UTILITY_OSTREAM_STRING_HPP
+#define BOOST_UTILITY_OSTREAM_STRING_HPP
+
+#include <boost/config.hpp>
+#include <iosfwd>
+#include <cstddef>
+
+namespace boost {
+namespace detail {
+
+template<class charT, class traits>
+inline std::size_t
+oss_put(std::basic_ostream<charT, traits>& os, const charT* data,
+    std::size_t size)
+{
+    return static_cast<std::size_t>(os.rdbuf()->sputn(data, size));
+}
+
+template<class charT, class traits>
+inline bool
+oss_fill(std::basic_ostream<charT, traits>& os, std::size_t size)
+{
+    charT c = os.fill();
+    charT fill[] = { c, c, c, c, c, c, c, c };
+    enum {
+        chunk = sizeof fill / sizeof(charT)
+    };
+    for (; size > chunk; size -= chunk) {
+        if (boost::detail::oss_put(os, fill, chunk) != chunk) {
+            return false;
+        }
+    }
+    return boost::detail::oss_put(os, fill, size) == size;
+}
+
+template<class charT, class traits>
+class oss_guard {
+public:
+    explicit oss_guard(std::basic_ostream<charT, traits>& os) BOOST_NOEXCEPT
+        : os_(&os) { }
+    ~oss_guard() BOOST_NOEXCEPT_IF(false) {
+        if (os_) {
+            os_->setstate(std::basic_ostream<charT, traits>::badbit);
+        }
+    }
+    void release() BOOST_NOEXCEPT {
+        os_ = 0;
+    }
+private:
+    oss_guard(const oss_guard&);
+    oss_guard& operator=(const oss_guard&);
+    std::basic_ostream<charT, traits>* os_;
+};
+
+} /* detail */
+
+template<class charT, class traits>
+inline std::basic_ostream<charT, traits>&
+ostream_string(std::basic_ostream<charT, traits>& os, const charT* data,
+    std::size_t size)
+{
+    typedef std::basic_ostream<charT, traits> stream;
+    detail::oss_guard<charT, traits> guard(os);
+    typename stream::sentry entry(os);
+    if (entry) {
+        std::size_t width = static_cast<std::size_t>(os.width());
+        if (width <= size) {
+            if (detail::oss_put(os, data, size) != size) {
+                return os;
+            }
+        } else if ((os.flags() & stream::adjustfield) == stream::left) {
+            if (detail::oss_put(os, data, size) != size ||
+                !detail::oss_fill(os, width - size)) {
+                return os;
+            }
+        } else if (!detail::oss_fill(os, width - size) ||
+            detail::oss_put(os, data, size) != size) {
+            return os;
+        }
+        os.width(0);
+    }
+    guard.release();
+    return os;
+}
+
+} /* boost */
+
+#endif

include/boost/utility/string_ref.hpp

@@ -1,5 +1,6 @@
 /*
    Copyright (c) Marshall Clow 2012-2015.
+   Copyright (c) Glen Joseph Fernandes 2019 (glenjofe@gmail.com)
 
    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -17,6 +18,7 @@
 
 #include <boost/config.hpp>
 #include <boost/detail/workaround.hpp>
+#include <boost/utility/ostream_string.hpp>
 #include <boost/utility/string_ref_fwd.hpp>
 #include <boost/throw_exception.hpp>
 
@@ -181,6 +183,7 @@ namespace boost {
             }
 
         size_type find(basic_string_ref s) const {
+            if (s.empty()) return 0;
             const_iterator iter = std::search ( this->cbegin (), this->cend (),
                                                 s.cbegin (), s.cend (), traits::eq );
             return iter == this->cend () ? npos : std::distance ( this->cbegin (), iter );
@@ -193,6 +196,7 @@ namespace boost {
             }
 
         size_type rfind(basic_string_ref s) const {
+            if (s.empty()) return 0;
             const_reverse_iterator iter = std::search ( this->crbegin (), this->crend (),
                                                 s.crbegin (), s.crend (), traits::eq );
             return iter == this->crend () ? npos : (std::distance(iter, this->crend()) - s.size());
@@ -419,52 +423,11 @@ namespace boost {
         return basic_string_ref<charT, traits>(x) >= y;
         }
 
-    namespace detail {
-
-        template<class charT, class traits>
-        inline void sr_insert_fill_chars(std::basic_ostream<charT, traits>& os, std::size_t n) {
-            enum { chunk_size = 8 };
-            charT fill_chars[chunk_size];
-            std::fill_n(fill_chars, static_cast< std::size_t >(chunk_size), os.fill());
-            for (; n >= chunk_size && os.good(); n -= chunk_size)
-                os.write(fill_chars, static_cast< std::size_t >(chunk_size));
-            if (n > 0 && os.good())
-                os.write(fill_chars, n);
-            }
-
-        template<class charT, class traits>
-        void sr_insert_aligned(std::basic_ostream<charT, traits>& os, const basic_string_ref<charT,traits>& str) {
-            const std::size_t size = str.size();
-            const std::size_t alignment_size = static_cast< std::size_t >(os.width()) - size;
-            const bool align_left = (os.flags() & std::basic_ostream<charT, traits>::adjustfield) == std::basic_ostream<charT, traits>::left;
-            if (!align_left) {
-                detail::sr_insert_fill_chars(os, alignment_size);
-                if (os.good())
-                    os.write(str.data(), size);
-                }
-            else {
-                os.write(str.data(), size);
-                if (os.good())
-                    detail::sr_insert_fill_chars(os, alignment_size);
-                }
-            }
-
-        } // namespace detail
-
     // Inserter
     template<class charT, class traits>
     inline std::basic_ostream<charT, traits>&
     operator<<(std::basic_ostream<charT, traits>& os, const basic_string_ref<charT,traits>& str) {
-        if (os.good()) {
+        return boost::ostream_string(os, str.data(), str.size());
-            const std::size_t size = str.size();
-            const std::size_t w = static_cast< std::size_t >(os.width());
-            if (w <= size)
-                os.write(str.data(), size);
-            else
-                detail::sr_insert_aligned(os, str);
-            os.width(0);
-            }
-        return os;
         }
 
 #if 0

include/boost/utility/string_view.hpp

@@ -1,6 +1,7 @@
 /*
    Copyright (c) Marshall Clow 2012-2015.
    Copyright (c) Beman Dawes 2015
+   Copyright (c) Glen Joseph Fernandes 2019 (glenjofe@gmail.com)
 
    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -19,8 +20,10 @@
 
 #include <boost/config.hpp>
 #include <boost/detail/workaround.hpp>
+#include <boost/utility/ostream_string.hpp>
 #include <boost/utility/string_view_fwd.hpp>
 #include <boost/throw_exception.hpp>
+#include <boost/container_hash/hash_fwd.hpp>
 
 #include <cstddef>
 #include <stdexcept>
@@ -570,53 +573,12 @@ namespace boost {
         return basic_string_view<charT, traits>(x) >= y;
         }
 
-    namespace detail {
-
-        template<class charT, class traits>
-        inline void sv_insert_fill_chars(std::basic_ostream<charT, traits>& os, std::size_t n) {
-            enum { chunk_size = 8 };
-            charT fill_chars[chunk_size];
-            std::fill_n(fill_chars, static_cast< std::size_t >(chunk_size), os.fill());
-            for (; n >= chunk_size && os.good(); n -= chunk_size)
-                os.write(fill_chars, static_cast< std::size_t >(chunk_size));
-            if (n > 0 && os.good())
-                os.write(fill_chars, n);
-            }
-
-        template<class charT, class traits>
-        void sv_insert_aligned(std::basic_ostream<charT, traits>& os, const basic_string_view<charT,traits>& str) {
-            const std::size_t size = str.size();
-            const std::size_t alignment_size = static_cast< std::size_t >(os.width()) - size;
-            const bool align_left = (os.flags() & std::basic_ostream<charT, traits>::adjustfield) == std::basic_ostream<charT, traits>::left;
-            if (!align_left) {
-                detail::sv_insert_fill_chars(os, alignment_size);
-                if (os.good())
-                    os.write(str.data(), size);
-                }
-            else {
-                os.write(str.data(), size);
-                if (os.good())
-                    detail::sv_insert_fill_chars(os, alignment_size);
-                }
-            }
-
-        } // namespace detail
-
     // Inserter
     template<class charT, class traits>
     inline std::basic_ostream<charT, traits>&
     operator<<(std::basic_ostream<charT, traits>& os,
       const basic_string_view<charT,traits>& str) {
-        if (os.good()) {
+        return boost::ostream_string(os, str.data(), str.size());
-            const std::size_t size = str.size();
-            const std::size_t w = static_cast< std::size_t >(os.width());
-            if (w <= size)
-                os.write(str.data(), size);
-            else
-                detail::sv_insert_aligned(os, str);
-            os.width(0);
-            }
-        return os;
         }
 
 #if 0
@@ -690,6 +652,10 @@ namespace boost {
         }
 #endif
 
+    template <class charT, class traits>
+    std::size_t hash_value(basic_string_view<charT, traits> s) {
+        return boost::hash_range(s.begin(), s.end());
+        }
 }
 
 #if 0

index.html

@@ -31,6 +31,7 @@
 				<a href="utility.htm#result_of">result_of</a><br>
 				<a href="throw_exception.html">throw_exception</a><br>
 				<a href="utility.htm">utility</a><br>
+            <a href="doc/html/ostream_string.html">ostream_string</a><br>
             <a href="doc/html/string_ref.html">string_ref</a><br>
             <a href="value_init.htm">value_init</a><br>
          </p>

operators.htm

@@ -1586,7 +1586,7 @@ T operator+( T lhs, const T& rhs )
     <h3><a name="a_demo">Arithmetic Operators Demonstration</a> and Test
     Program</h3>
 
-    <p>The <cite><a href="operators_test.cpp">operators_test.cpp</a></cite>
+    <p>The <cite><a href="test/operators_test.cpp">operators_test.cpp</a></cite>
     program demonstrates the use of the arithmetic operator templates, and
     can also be used to verify correct operation. Check the compiler status
     report for the test results with selected platforms.</p>
@@ -1998,7 +1998,7 @@ struct function_output_iterator
 
     <h3><a name="i_demo">Iterator Demonstration</a> and Test Program</h3>
 
-    <p>The <cite><a href="iterators_test.cpp">iterators_test.cpp</a></cite>
+    <p>The <cite><a href="test/iterators_test.cpp">iterators_test.cpp</a></cite>
     program demonstrates the use of the iterator templates, and can also be
     used to verify correct operation. The following is the custom iterator
     defined in the test program. It demonstrates a correct (though trivial)
@@ -2064,7 +2064,7 @@ public:
       <dt><a href="http://www.boost.org/people/beman_dawes.html">Beman Dawes</a></dt>
 
       <dd>Contributed <cite><a href=
-      "operators_test.cpp">operators_test.cpp</a></cite>.</dd>
+      "test/operators_test.cpp">operators_test.cpp</a></cite>.</dd>
 
       <dt><a href="http://www.boost.org/people/daryle_walker.html">Daryle Walker</a></dt>
 

test/Jamfile.v2

@@ -16,6 +16,7 @@ run binary_test.cpp ;
 run call_traits_test.cpp : -u ;
 
 run compressed_pair_test.cpp ;
+run compressed_pair_final_test.cpp ;
 
 run iterators_test.cpp ;
 
@@ -41,3 +42,5 @@ compile-fail value_init_test_fail2.cpp ;
 compile-fail value_init_test_fail3.cpp ;
 compile-fail initialized_test_fail1.cpp ;
 compile-fail initialized_test_fail2.cpp ;
+
+run ostream_string_test.cpp ;

test/compressed_pair_final_test.cpp

@@ -0,0 +1,55 @@
+/*
+Copyright 2018 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_CXX11_FINAL)
+#include <boost/compressed_pair.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct type1 {
+    operator bool() const {
+        return false;
+    }
+};
+
+struct type2 final {
+    operator bool() const {
+        return false;
+    }
+};
+
+#if !defined(BOOST_IS_FINAL)
+namespace boost {
+
+template<>
+struct is_final<type2>
+    : true_type { };
+
+} /* boost*/
+#endif
+
+template<class T1, class T2>
+void test()
+{
+    boost::compressed_pair<T1, T2> p;
+    BOOST_TEST(!p.first());
+    BOOST_TEST(!p.second());
+}
+
+int main()
+{
+    test<type1, type2>();
+    test<type2, type1>();
+    test<type2, type2>();
+    return boost::report_errors();
+}
+#else
+int main()
+{
+    return 0;
+}
+#endif

test/ostream_string_test.cpp

@@ -0,0 +1,136 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/lightweight_test.hpp>
+#include <boost/utility/ostream_string.hpp>
+#include <sstream>
+#include <string>
+
+int main()
+{
+    {
+        std::ostringstream os;
+        os.width(1);
+        os.fill('.');
+        os.setf(std::ios_base::left, std::ios_base::adjustfield);
+        boost::ostream_string(os, "xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == "xy");
+    }
+    {
+        std::wostringstream os;
+        os.width(1);
+        os.fill('.');
+        os.setf(std::ios_base::left, std::ios_base::adjustfield);
+        boost::ostream_string(os, L"xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == L"xy");
+    }
+    {
+        std::ostringstream os;
+        os.width(1);
+        os.fill('.');
+        os.setf(std::ios_base::right, std::ios_base::adjustfield);
+        boost::ostream_string(os, "xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == "xy");
+    }
+    {
+        std::wostringstream os;
+        os.width(1);
+        os.fill('.');
+        os.setf(std::ios_base::right, std::ios_base::adjustfield);
+        boost::ostream_string(os, L"xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == L"xy");
+    }
+    {
+        std::ostringstream os;
+        os.width(4);
+        os.fill('.');
+        os.setf(std::ios_base::left, std::ios_base::adjustfield);
+        boost::ostream_string(os, "xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == "xy..");
+    }
+    {
+        std::wostringstream os;
+        os.width(4);
+        os.fill(L'.');
+        os.setf(std::ios_base::left, std::ios_base::adjustfield);
+        boost::ostream_string(os, L"xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == L"xy..");
+    }
+    {
+        std::ostringstream os;
+        os.width(4);
+        os.fill('.');
+        os.setf(std::ios_base::right, std::ios_base::adjustfield);
+        boost::ostream_string(os, "xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == "..xy");
+    }
+    {
+        std::wostringstream os;
+        os.width(4);
+        os.fill(L'.');
+        os.setf(std::ios_base::right, std::ios_base::adjustfield);
+        boost::ostream_string(os, L"xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == L"..xy");
+    }
+    {
+        std::ostringstream os;
+        os.width(12);
+        os.fill('.');
+        os.setf(std::ios_base::left, std::ios_base::adjustfield);
+        boost::ostream_string(os, "xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == "xy..........");
+    }
+    {
+        std::wostringstream os;
+        os.width(12);
+        os.fill(L'.');
+        os.setf(std::ios_base::left, std::ios_base::adjustfield);
+        boost::ostream_string(os, L"xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == L"xy..........");
+    }
+    {
+        std::ostringstream os;
+        os.width(12);
+        os.fill('.');
+        os.setf(std::ios_base::right, std::ios_base::adjustfield);
+        boost::ostream_string(os, "xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == "..........xy");
+    }
+    {
+        std::wostringstream os;
+        os.width(12);
+        os.fill(L'.');
+        os.setf(std::ios_base::right, std::ios_base::adjustfield);
+        boost::ostream_string(os, L"xy", 2);
+        BOOST_TEST(os.good());
+        BOOST_TEST(os.width() == 0);
+        BOOST_TEST(os.str() == L"..........xy");
+    }
+    return boost::report_errors();
+}

test/string_ref_test2.cpp

@@ -93,6 +93,10 @@ void find ( const char *arg ) {
     string_ref sr2;
     const char *p;
 
+//	When we search for the empty string, we find it at position 0
+    BOOST_TEST ( sr1.find (sr2) == 0 );
+    BOOST_TEST ( sr1.rfind(sr2) == 0 );
+
 //  Look for each character in the string(searching from the start)
     p = arg;
     sr1 = arg;

test/string_view_test1.cpp

@@ -12,6 +12,7 @@
 #include <string>
 
 #include <boost/utility/string_view.hpp>
+#include <boost/container_hash/hash.hpp>
 
 #include <boost/core/lightweight_test.hpp>
 
@@ -85,6 +86,14 @@ void test_remove ( const std::string &str ) {
       }
     }
 
+void test_hash(const std::string& str) {
+    string_view ref = str;
+    BOOST_TEST(boost::hash_value(ref) == boost::hash_value(str));
+    boost::hash<std::string> hstr;
+    boost::hash<string_view> hsv;
+    BOOST_TEST(hsv(ref) == hstr(str));
+    }
+
 const char *test_strings [] = {
     "",
     "1",
@@ -102,6 +111,7 @@ int main()
         test_substr ( *p );
         test_remove ( *p );
         null_tests ( *p );
+        test_hash( *p );
 
         p++;
         }

test/string_view_test2.cpp

@@ -97,6 +97,10 @@ void find ( const char *arg ) {
     string_view sr2;
     const char *p;
 
+//	When we search for the empty string, we find it at position 0
+    BOOST_TEST ( sr1.find (sr2) == 0 );
+    BOOST_TEST ( sr1.rfind(sr2) == 0 );
+
 //  Look for each character in the string(searching from the start)
     p = arg;
     sr1 = arg;