GL: return Containers::Pair from version().

This one was spectacular -- ALL uses of it had also #include <tuple> in
order to std::tie() the result into separate major & minor variables. So
much compile time overhead for so little.

doc/changelog.dox

@@ -1467,6 +1467,8 @@ See also:
         @ref GL::Buffer::setLabel() "setLabel()" APIs now work with a
         @relativeref{Corrade,Containers::StringView} /
         @relativeref{Corrade,Containers::String} instead of a @ref std::string
+    -   @ref GL::version(Version) now returns a
+        @relativeref{Corrade,Containers::Pair} instead of a @ref std::pair
     -   @ref MeshTools::compressIndices(), @ref MeshTools::removeDuplicates()
         and related APIs now return a @relativeref{Corrade,Containers::Pair}
         instead of a @ref std::pair

src/Magnum/GL/Context.cpp

@@ -920,9 +920,9 @@ bool Context::tryCreate(const Configuration& configuration) {
     #endif
     {
         #ifndef MAGNUM_TARGET_GLES
-        Error{} << "GL::Context: unsupported OpenGL version" << std::make_pair(majorVersion, minorVersion);
+        Error{} << "GL::Context: unsupported OpenGL version" << Containers::pair(majorVersion, minorVersion);
         #else
-        Error{} << "GL::Context: unsupported OpenGL ES version" << std::make_pair(majorVersion, minorVersion);
+        Error{} << "GL::Context: unsupported OpenGL ES version" << Containers::pair(majorVersion, minorVersion);
         #endif
 
         /* Reset the version so the context is not marked as successfully created */

src/Magnum/GL/Test/VersionTest.cpp

@@ -24,6 +24,7 @@
 */
 
 #include <sstream>
+#include <Corrade/Containers/Pair.h>
 #include <Corrade/TestSuite/Tester.h>
 #include <Corrade/Utility/DebugStl.h>
 
@@ -76,15 +77,15 @@ void VersionTest::fromNumber() {
 
 void VersionTest::toNumber() {
     #ifndef MAGNUM_TARGET_GLES
-    CORRADE_COMPARE(version(Version::GL430), std::make_pair(4, 3));
+    CORRADE_COMPARE(version(Version::GL430), Containers::pair(4, 3));
     #else
-    CORRADE_COMPARE(version(Version::GLES300), std::make_pair(3, 0));
+    CORRADE_COMPARE(version(Version::GLES300), Containers::pair(3, 0));
     #endif
 }
 
 #ifndef MAGNUM_TARGET_GLES
 void VersionTest::toNumberES() {
-    CORRADE_COMPARE(version(Version::GLES310), std::make_pair(3, 1));
+    CORRADE_COMPARE(version(Version::GLES310), Containers::pair(3, 1));
 }
 #endif
 

src/Magnum/GL/Version.cpp

@@ -25,10 +25,20 @@
 
 #include "Version.h"
 
+#include <Corrade/Containers/Pair.h>
 #include <Corrade/Utility/Debug.h>
 
 namespace Magnum { namespace GL {
 
+Containers::Pair<Int, Int> version(const Version version)  {
+    const Int v = Int(version)
+        #ifndef MAGNUM_TARGET_GLES
+        & ~Implementation::VersionESMask
+        #endif
+        ;
+    return {v/100, (v%100)/10};
+}
+
 #ifndef DOXYGEN_GENERATING_OUTPUT
 Debug& operator<<(Debug& debug, const Version value) {
     switch(value) {

src/Magnum/GL/Version.h

@@ -29,11 +29,14 @@
  * @brief Enum @ref Magnum::GL::Version, function @ref Magnum::GL::version(), @ref Magnum::GL::isVersionES()
  */
 
-#include <utility> /* std::pair */
-
 #include "Magnum/Magnum.h"
 #include "Magnum/GL/visibility.h"
 
+#ifdef MAGNUM_BUILD_DEPRECATED
+/* version() returned std::pair before */
+#include <Corrade/Containers/PairStl.h>
+#endif
+
 namespace Magnum { namespace GL {
 
 #ifndef MAGNUM_TARGET_GLES
@@ -135,14 +138,7 @@ constexpr Version version(Int major, Int minor) {
 
 @see @ref isVersionES()
 */
-inline std::pair<Int, Int> version(Version version) {
-    const Int v = Int(version)
-        #ifndef MAGNUM_TARGET_GLES
-        & ~Implementation::VersionESMask
-        #endif
-        ;
-    return {v/100, (v%100)/10};
-}
+MAGNUM_GL_EXPORT Containers::Pair<Int, Int> version(Version version);
 
 /**
 @brief Whether given version is OpenGL ES or WebGL

src/Magnum/Platform/GlfwApplication.cpp

@@ -28,7 +28,6 @@
 
 #include "GlfwApplication.h"
 
-#include <tuple>
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/StridedArrayView.h>
 #include <Corrade/Utility/Arguments.h>
@@ -463,10 +462,9 @@ bool GlfwApplication::tryCreate(const Configuration& configuration, const GLConf
 
     /* Set context version, if requested */
     if(glConfiguration.version() != GL::Version::None) {
-        Int major, minor;
-        std::tie(major, minor) = version(glConfiguration.version());
-        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, major);
-        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, minor);
+        const Containers::Pair<Int, Int> versionMajorMinor = version(glConfiguration.version());
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, versionMajorMinor.first());
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, versionMajorMinor.second());
         #ifndef MAGNUM_TARGET_GLES
         if(glConfiguration.version() >= GL::Version::GL320) {
             glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

src/Magnum/Platform/Implementation/EglContextHandler.cpp

@@ -25,7 +25,6 @@
 
 #include "EglContextHandler.h"
 
-#include <tuple>
 #include <EGL/eglext.h>
 #include <Corrade/Utility/Debug.h>
 
@@ -112,13 +111,12 @@ void EglContextHandler::createContext(const AbstractXApplication::GLConfiguratio
        EGL_KHR_create_context. */
     /** @todo Test for presence of EGL_KHR_create_context extension */
     if(glConfiguration.version() != GL::Version::None) {
-        Int major, minor;
-        std::tie(major, minor) = version(glConfiguration.version());
+        const Containers::Pair<Int, Int> versionMajorMinor = version(glConfiguration.version());
 
         attributes[0] = EGL_CONTEXT_MAJOR_VERSION_KHR;
-        attributes[1] = major;
+        attributes[1] = versionMajorMinor.first();
         attributes[2] = EGL_CONTEXT_MINOR_VERSION_KHR;
-        attributes[3] = minor;
+        attributes[3] = versionMajorMinor.second();
 
         #ifndef MAGNUM_TARGET_GLES
         if(glConfiguration.version() >= GL::Version::GL310) {

src/Magnum/Platform/Implementation/GlxContextHandler.cpp

@@ -26,7 +26,6 @@
 #include "GlxContextHandler.h"
 
 #include <cstdlib>
-#include <tuple>
 #include <GL/glxext.h>
 #include <Corrade/Utility/Debug.h>
 
@@ -86,13 +85,12 @@ void GlxContextHandler::createContext(const AbstractXApplication::GLConfiguratio
 
     /* Set context version, if requested */
     if(glConfiguration.version() != GL::Version::None) {
-        Int major, minor;
-        std::tie(major, minor) = version(glConfiguration.version());
+        const Containers::Pair<Int, Int> versionMajorMinor = version(glConfiguration.version());
 
         attributes[0] = GLX_CONTEXT_MAJOR_VERSION_ARB;
-        attributes[1] = major;
+        attributes[1] = versionMajorMinor.first();
         attributes[2] = GLX_CONTEXT_MINOR_VERSION_ARB;
-        attributes[3] = minor;
+        attributes[3] = versionMajorMinor.second();
 
         #ifndef MAGNUM_TARGET_GLES
         if(glConfiguration.version() >= GL::Version::GL310) {

src/Magnum/Platform/Sdl2Application.cpp

@@ -38,9 +38,7 @@
 #ifdef CORRADE_TARGET_CLANG_CL
 #pragma clang diagnostic pop
 #endif
-#ifndef CORRADE_TARGET_EMSCRIPTEN
-#include <tuple>
-#else
+#ifdef CORRADE_TARGET_EMSCRIPTEN
 #include <emscripten/emscripten.h>
 #include <emscripten/html5.h>
 #endif
@@ -515,10 +513,9 @@ bool Sdl2Application::tryCreate(const Configuration& configuration, const GLConf
 
     /* Set context version, if user-specified */
     if(glConfiguration.version() != GL::Version::None) {
-        Int major, minor;
-        std::tie(major, minor) = version(glConfiguration.version());
-        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, major);
-        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, minor);
+        const Containers::Pair<Int, Int> versionMajorMinor = version(glConfiguration.version());
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, versionMajorMinor.first());
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, versionMajorMinor.second());
 
         #ifndef MAGNUM_TARGET_GLES
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, glConfiguration.version() >= GL::Version::GL310 ?