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coord/base: add comments for constructors

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Danny Robson 2017-08-24 14:34:22 +10:00
parent a14847bb59
commit 1d4992e3e4
1 changed files with 11 additions and 2 deletions
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13
coord/base.hpp
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@ -40,13 +40,22 @@ namespace util::coord {
static constexpr size_t dimension = S; static constexpr size_t dimension = S;
static constexpr size_t elements = S; static constexpr size_t elements = S;
/// returns the number of elements we contain
static constexpr size_t size (void) { return S; } static constexpr size_t size (void) { return S; }
// constructors // inherit the fancy elementwise constructors from `init'.
using init<S,T,tags...>::init; using init<S,T,tags...>::init;
/// constructs, but does not initialise, the data.
///
/// used to avoid unnecessary initialisation in many situations where
/// we have arrays of these types that are about to be overwritten. it
/// is a very important performance optimisation.
base () = default; base () = default;
constexpr explicit base (T val) /// constructs an instance where all elements are initialised to `val'.
constexpr explicit
base (T val)
{ std::fill (begin (), end (), val); } { std::fill (begin (), end (), val); }
constexpr base (const base<S,T,KLASS,tags...> &rhs) = default; constexpr base (const base<S,T,KLASS,tags...> &rhs) = default;