diff --git a/.travis.yml b/.travis.yml
index 4f49868..e873c65 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,11 +26,11 @@ matrix:
   include:
     - os: linux
       compiler: g++
-      env: TOOLSET=gcc COMPILER=g++ CXXSTD=03,11
+      env: TOOLSET=gcc COMPILER=g++ CXXSTD=11
 
     - os: linux
       compiler: g++-4.4
-      env: TOOLSET=gcc COMPILER=g++-4.4 CXXSTD=98,0x
+      env: TOOLSET=gcc COMPILER=g++-4.4 CXXSTD=0x
       addons:
         apt:
           packages:
@@ -40,7 +40,7 @@ matrix:
 
     - os: linux
       compiler: g++-4.6
-      env: TOOLSET=gcc COMPILER=g++-4.6 CXXSTD=03,0x
+      env: TOOLSET=gcc COMPILER=g++-4.6 CXXSTD=0x
       addons:
         apt:
           packages:
@@ -50,7 +50,7 @@ matrix:
 
     - os: linux
       compiler: g++-4.7
-      env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=03,11
+      env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=11
       addons:
         apt:
           packages:
@@ -60,7 +60,7 @@ matrix:
 
     - os: linux
       compiler: g++-4.8
-      env: TOOLSET=gcc COMPILER=g++-4.8 CXXSTD=03,11
+      env: TOOLSET=gcc COMPILER=g++-4.8 CXXSTD=11
       addons:
         apt:
           packages:
@@ -70,7 +70,7 @@ matrix:
 
     - os: linux
       compiler: g++-4.9
-      env: TOOLSET=gcc COMPILER=g++-4.9 CXXSTD=03,11
+      env: TOOLSET=gcc COMPILER=g++-4.9 CXXSTD=11
       addons:
         apt:
           packages:
@@ -80,7 +80,7 @@ matrix:
 
     - os: linux
       compiler: g++-5
-      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=03,11,14,1z
+      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -90,7 +90,7 @@ matrix:
 
     - os: linux
       compiler: g++-6
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=03,11,14,1z
+      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -100,7 +100,7 @@ matrix:
 
     - os: linux
       compiler: g++-7
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=03,11,14,17
+      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=11,14,17
       addons:
         apt:
           packages:
@@ -110,7 +110,7 @@ matrix:
 
     - os: linux
       compiler: g++-8
-      env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17
+      env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=11,14,17
       addons:
         apt:
           packages:
@@ -120,7 +120,7 @@ matrix:
 
     - os: linux
       compiler: g++-9
-      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=03,11,14,17,2a
+      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=11,14,17,2a
       addons:
         apt:
           packages:
@@ -130,7 +130,7 @@ matrix:
 
     - os: linux
       compiler: g++-8
-      env: UBSAN=1 TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17 UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
+      env: UBSAN=1 TOOLSET=gcc COMPILER=g++-8 CXXSTD=11,14,17 UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
       addons:
         apt:
           packages:
@@ -140,11 +140,11 @@ matrix:
 
     - os: linux
       compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
 
     - os: linux
       compiler: clang++-3.5
-      env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -155,7 +155,7 @@ matrix:
 
     - os: linux
       compiler: clang++-3.6
-      env: TOOLSET=clang COMPILER=clang++-3.6 CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++-3.6 CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -166,7 +166,7 @@ matrix:
 
     - os: linux
       compiler: clang++-3.8
-      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -177,7 +177,7 @@ matrix:
 
     - os: linux
       compiler: clang++-3.9
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -188,7 +188,7 @@ matrix:
 
     - os: linux
       compiler: clang++-4.0
-      env: TOOLSET=clang COMPILER=clang++-4.0 CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++-4.0 CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -199,7 +199,7 @@ matrix:
 
     - os: linux
       compiler: clang++-5.0
-      env: TOOLSET=clang COMPILER=clang++-5.0 CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++-5.0 CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -210,7 +210,7 @@ matrix:
 
     - os: linux
       compiler: clang++-6.0
-      env: TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=03,11,14,17
+      env: TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=11,14,17
       addons:
         apt:
           packages:
@@ -221,7 +221,7 @@ matrix:
 
     - os: linux
       compiler: clang++-7
-      env: TOOLSET=clang COMPILER=clang++-7 CXXSTD=03,11,14,17
+      env: TOOLSET=clang COMPILER=clang++-7 CXXSTD=11,14,17
       addons:
         apt:
           packages:
@@ -232,7 +232,7 @@ matrix:
 
     - os: linux
       compiler: clang++-8
-      env: TOOLSET=clang COMPILER=clang++-8 CXXSTD=03,11,14,17,2a
+      env: TOOLSET=clang COMPILER=clang++-8 CXXSTD=11,14,17,2a
       addons:
         apt:
           packages:
@@ -244,7 +244,7 @@ matrix:
     - os: linux
       dist: xenial
       compiler: clang++-9
-      env: TOOLSET=clang COMPILER=clang++-9 CXXSTD=03,11,14,17,2a
+      env: TOOLSET=clang COMPILER=clang++-9 CXXSTD=11,14,17,2a
       addons:
         apt:
           packages:
@@ -256,7 +256,7 @@ matrix:
 
     - os: linux
       compiler: clang++-6.0
-      env: UBSAN=1 TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
+      env: UBSAN=1 TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=11,14,1z UBSAN_OPTIONS=print_stacktrace=1
       addons:
         apt:
           packages:
@@ -268,7 +268,7 @@ matrix:
 
     - os: linux
       compiler: clang++-libc++
-      env: TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -277,7 +277,7 @@ matrix:
 
     - os: linux
       compiler: clang++-libc++
-      env: UBSAN=1 TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
+      env: UBSAN=1 TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=11,14,1z UBSAN_OPTIONS=print_stacktrace=1
       addons:
         apt:
           packages:
@@ -286,22 +286,22 @@ matrix:
 
     - os: osx
       compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11,14,1z
       osx_image: xcode7.3
 
     - os: osx
       compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11,14,1z
       osx_image: xcode8.3
 
     - os: osx
       compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11,14,1z
       osx_image: xcode9.4
 
     - os: osx
       compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11,14,1z
       osx_image: xcode10.1
 
     - os: linux