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Specifically, we use numeric_limits::max() to get the largest element. Since std::array has no way of knowing its size, we must pass the size of the array explicitly -- the third template argument in many of the declarations below.
The template parameter deduction rules require that the name inside the template argument list be a unique type that is deducible. For example, the above would be an error, as the template param name is a template parameter of some kind.
The callee is only allowed to deduce the type of the argument pointed to by the captured this pointer. The implicitly deduced type may be different from the explicitly captured type, but the two types must be convertible to each other. For example, in the foo below, the parameter x may be deduced as int, even though foo& is not-int.
However, the explicitly captured type may be different from the deduced type. For example, in the foo below, the parameter x is deduced as double, but the capture object is an int. The call to the callee is not allowed in this case.
The this pointer is actually a pointer-to-member, and the callee is allowed to dereference it. This means that one is legal, as it contains a member called foo, which takes a single int. This produces code that is more generic , as it doesn't rely on any class hierarchy.
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Use explicit type arguments for ordinary functions. Constrained templates with explicit template arguments are your only exception (also including templates with template parameters that are default constrained and non-type template arguments). That's because properties of those templates express pathomorphisms of ordinary functions, and those pathomorphisms must be emitted as normal functions. That constraint on the paths of function template specialization also doesn't affect pure functions, however. d2c66b5586