Init

cppdraft/complex/numbers/general.md

@@ -0,0 +1,61 @@
+[complex.numbers.general]
+
+# 29 Numerics library [[numerics]](./#numerics)
+
+## 29.4 Complex numbers [[complex.numbers]](complex.numbers#general)
+
+### 29.4.1 General [complex.numbers.general]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L180)
+
+The header [<complex>](complex.syn#header:%3ccomplex%3e "29.4.2 Header <complex> synopsis [complex.syn]") defines a class template,
+and numerous functions for representing and manipulating complex numbers[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L184)
+
+The effect of instantiating the primary template of complex for any type
+that is not a cv-unqualified floating-point type ([[basic.fundamental]](basic.fundamental "6.9.2 Fundamental types"))
+is unspecified[.](#2.sentence-1)
+
+Specializations of complex for cv-unqualified floating-point types
+are trivially copyable literal types ([[basic.types.general]](basic.types.general#term.literal.type "6.9.1 General"))[.](#2.sentence-2)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L191)
+
+If the result of a function is not mathematically defined or not in
+the range of representable values for its type, the behavior is
+undefined[.](#3.sentence-1)
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L196)
+
+If z is an lvalue of type cv complex<T> then:
+
+- [(4.1)](#4.1)
+
+the expression reinterpret_cast<cv T(&)[2]>(z) is well-formed,
+
+- [(4.2)](#4.2)
+
+reinterpret_cast<cv T(&)[2]>(z)[0] designates the real part of z, and
+
+- [(4.3)](#4.3)
+
+reinterpret_cast<cv T(&)[2]>(z)[1] designates the imaginary part of z[.](#4.sentence-1)
+
+Moreover, if a is an expression of type cv complex<T>* and the expression a[i] is well-defined for an integer expression i, then:
+
+- [(4.4)](#4.4)
+
+reinterpret_cast<cv T*>(a)[2 * i] designates the real part of a[i], and
+
+- [(4.5)](#4.5)
+
+reinterpret_cast<cv T*>(a)[2 * i + 1] designates the imaginary part of a[i][.](#4.sentence-2)