Update .travis.yml

Change broken sgi/stl links to boost.org.

.travis.yml

@@ -6,6 +6,8 @@ language: cpp
 
 sudo: false
 
+dist: trusty
+
 branches:
   only:
     - master
@@ -116,6 +118,16 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
 
+    - os: linux
+      compiler: g++-9
+      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - g++-9
+          sources:
+            - ubuntu-toolchain-r-test
+
     - os: linux
       compiler: clang++
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
@@ -238,6 +250,17 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-trusty-7
 
+    - os: linux
+      compiler: clang++-8
+      env: TOOLSET=clang COMPILER=clang++-8 CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - clang-8
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty-8
+
     - os: linux
       compiler: clang++-libc++
       env: TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=03,11,14,1z VARIANT=release

appveyor.yml

@@ -14,7 +14,7 @@ branches:
 
 environment:
   matrix:
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       TOOLSET: msvc-12.0,msvc-14.0
@@ -23,19 +23,19 @@ environment:
       TOOLSET: msvc-14.1,clang-win
       CXXSTD: 14,17
       ADDRESS_MODEL: 32,64
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin64\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\mingw\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin;
       TOOLSET: gcc
       CXXSTD: 03,11,14,1z

doc/bind/troubleshooting.qbk

@@ -167,8 +167,8 @@ variable:
 [section Modeling STL function object concepts]
 
 The function objects that are produced by `bind` do not model the STL
-[@http://www.sgi.com/tech/stl/UnaryFunction.html /Unary Function/] or
-[@http://www.sgi.com/tech/stl/BinaryFunction.html /Binary Function/] concepts,
+[@https://boost.org/sgi/stl/UnaryFunction.html /Unary Function/] or
+[@https://boost.org/sgi/stl/BinaryFunction.html /Binary Function/] concepts,
 even when the function objects are unary or binary operations, because the
 function object types are missing public typedefs `result_type` and
 `argument_type` or `first_argument_type` and `second_argument_type`. In cases

doc/html/bind.html

@@ -900,8 +900,8 @@
 </h3></div></div></div>
 <p>
         The function objects that are produced by <code class="computeroutput"><span class="identifier">bind</span></code>
-        do not model the STL <a href="http://www.sgi.com/tech/stl/UnaryFunction.html" target="_top"><span class="emphasis"><em>Unary
-        Function</em></span></a> or <a href="http://www.sgi.com/tech/stl/BinaryFunction.html" target="_top"><span class="emphasis"><em>Binary
+        do not model the STL <a href="https://boost.org/sgi/stl/UnaryFunction.html" target="_top"><span class="emphasis"><em>Unary
+        Function</em></span></a> or <a href="https://boost.org/sgi/stl/BinaryFunction.html" target="_top"><span class="emphasis"><em>Binary
         Function</em></span></a> concepts, even when the function objects are
         unary or binary operations, because the function object types are missing
         public typedefs <code class="computeroutput"><span class="identifier">result_type</span></code>