Constness issue between QGLContext::currentContext() and QGLContext::makeCurrent()?

[christophe3d]

I am curious why QGLContext::currentContext() returns a const QGLcontext *, but QGLContext::makeCurrent() is not const. This makes it impossible to save a context to make it current later without casting. Are there non-obvious restrictions that would make the following illegal:

QGLContext *saveContext = QGLContext::currentContext();
 
// [... Something that possibly changes the context ]
 
saveContext->makeCurrent();

QGLContext *saveContext = QGLContext::currentContext();

// [... Something that possibly changes the context ]

saveContext->makeCurrent();

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[wysota]

Usually you'd use QGLWidget::makeCurrent()