With two-phase lookup errors in code that does not depend on template arguments are caught earlier (when the template is defined) than with one-phase lookup (wh

With two-phase lookup errors in code that does not depend on template arguments are caught earlier (when the template is defined) than with one-phase lookup (when the template is instanciated). Which is why template code written for Visual Studio might not compile with a standard conforming compiler. >instantiating a template is literally a textual substitution I'm being pedantic here, but that's not quite the case. Example: template <typename T> void foo() { T t; ... } foo<int[2]>(); With simple textual substitution this would result in a syntax error, as int[2] t; isn't valid C++ code.