Check that lazy_ostream argument is printable #323
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The operator() is not instantiated till later, which makes it difficult to locate an erroneous usage of <<. Place a static_assert in the ctor (copied from print_helper.hpp) to check at construction time, which will point back to the << site.
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The operator() is not instantiated till later, which makes it
difficult to locate an erroneous usage of <<. Place a
static_assert in the ctor (copied from print_helper.hpp) to check
at construction time, which will point back to the << site.