pybind11/complex.h: Complex number support

    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>

    All rights reserved. Use of this source code is governed by a
    BSD-style license that can be found in the LICENSE file.

#pragma once

#include "pybind11.h"
#include <complex>

/// glibc defines I as a macro which breaks things, e.g., boost template names
#ifdef I
#  undef I


template <typename T> struct format_descriptor<std::complex<T>, detail::enable_if_t<std::is_floating_point<T>::value>> {
    static constexpr const char c = format_descriptor<T>::c;
    static constexpr const char value[3] = { 'Z', c, '\0' };
    static std::string format() { return std::string(value); }

#ifndef PYBIND11_CPP17

template <typename T> constexpr const char format_descriptor<
    std::complex<T>, detail::enable_if_t<std::is_floating_point<T>::value>>::value[3];



template <typename T> struct is_fmt_numeric<std::complex<T>, detail::enable_if_t<std::is_floating_point<T>::value>> {
    static constexpr bool value = true;
    static constexpr int index = is_fmt_numeric<T>::index + 3;

template <typename T> class type_caster<std::complex<T>> {
    bool load(handle src, bool convert) {
        if (!src)
            return false;
        if (!convert && !PyComplex_Check(src.ptr()))
            return false;
        Py_complex result = PyComplex_AsCComplex(src.ptr());
        if (result.real == -1.0 && PyErr_Occurred()) {
            return false;
        value = std::complex<T>((T) result.real, (T) result.imag);
        return true;

    static handle cast(const std::complex<T> &src, return_value_policy /* policy */, handle /* parent */) {
        return PyComplex_FromDoubles((double) src.real(), (double) src.imag());

    PYBIND11_TYPE_CASTER(std::complex<T>, _("complex"));