mirror of
https://github.com/pybind/pybind11.git
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617fbcfc1e
This commit includes the following changes:
* Don't provide make_copy_constructor for non-copyable container
make_copy_constructor currently fails for various stl containers (e.g.
std::vector, std::unordered_map, std::deque, etc.) when the container's
value type (e.g. the "T" or the std::pair<K,T> for a map) is
non-copyable. This adds an override that, for types that look like
containers, also requires that the value_type be copyable.
* stl_bind.h: make bind_{vector,map} work for non-copy-constructible types
Most stl_bind modifiers require copying, so if the type isn't copy
constructible, we provide a read-only interface instead.
In practice, this means that if the type is non-copyable, it will be,
for all intents and purposes, read-only from the Python side (but
currently it simply fails to compile with such a container).
It is still possible for the caller to provide an interface manually
(by defining methods on the returned class_ object), but this isn't
something stl_bind can handle because the C++ code to construct values
is going to be highly dependent on the container value_type.
* stl_bind: copy only for arithmetic value types
For non-primitive types, we may well be copying some complex type, when
returning by reference is more appropriate. This commit returns by
internal reference for all but basic arithmetic types.
* Return by reference whenever possible
Only if we definitely can't--i.e. std::vector<bool>--because v[i]
returns something that isn't a T& do we copy; for everything else, we
return by reference.
For the map case, we can always return by reference (at least for the
default stl map/unordered_map).
96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
/*
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tests/test_stl_binders.cpp -- Usage of stl_binders functions
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Copyright (c) 2016 Sergey Lyskov
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#include "pybind11_tests.h"
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#include <pybind11/stl_bind.h>
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#include <map>
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#include <deque>
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#include <unordered_map>
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class El {
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public:
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El() = delete;
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El(int v) : a(v) { }
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int a;
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};
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std::ostream & operator<<(std::ostream &s, El const&v) {
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s << "El{" << v.a << '}';
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return s;
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}
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/// Issue #487: binding std::vector<E> with E non-copyable
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class E_nc {
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public:
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explicit E_nc(int i) : value{i} {}
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E_nc(const E_nc &) = delete;
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E_nc &operator=(const E_nc &) = delete;
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E_nc(E_nc &&) = default;
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E_nc &operator=(E_nc &&) = default;
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int value;
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};
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template <class Container> Container *one_to_n(int n) {
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auto v = new Container();
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for (int i = 1; i <= n; i++)
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v->emplace_back(i);
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return v;
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}
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template <class Map> Map *times_ten(int n) {
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auto m = new Map();
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for (int i = 1; i <= n; i++)
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m->emplace(int(i), E_nc(10*i));
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return m;
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}
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test_initializer stl_binder_vector([](py::module &m) {
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py::class_<El>(m, "El")
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.def(py::init<int>());
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py::bind_vector<std::vector<unsigned int>>(m, "VectorInt");
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py::bind_vector<std::vector<bool>>(m, "VectorBool");
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py::bind_vector<std::vector<El>>(m, "VectorEl");
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py::bind_vector<std::vector<std::vector<El>>>(m, "VectorVectorEl");
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});
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test_initializer stl_binder_map([](py::module &m) {
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py::bind_map<std::map<std::string, double>>(m, "MapStringDouble");
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py::bind_map<std::unordered_map<std::string, double>>(m, "UnorderedMapStringDouble");
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py::bind_map<std::map<std::string, double const>>(m, "MapStringDoubleConst");
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py::bind_map<std::unordered_map<std::string, double const>>(m, "UnorderedMapStringDoubleConst");
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});
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test_initializer stl_binder_noncopyable([](py::module &m) {
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py::class_<E_nc>(m, "ENC")
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.def(py::init<int>())
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.def_readwrite("value", &E_nc::value);
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py::bind_vector<std::vector<E_nc>>(m, "VectorENC");
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m.def("get_vnc", &one_to_n<std::vector<E_nc>>, py::return_value_policy::reference);
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py::bind_vector<std::deque<E_nc>>(m, "DequeENC");
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m.def("get_dnc", &one_to_n<std::deque<E_nc>>, py::return_value_policy::reference);
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py::bind_map<std::map<int, E_nc>>(m, "MapENC");
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m.def("get_mnc", ×_ten<std::map<int, E_nc>>, py::return_value_policy::reference);
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py::bind_map<std::unordered_map<int, E_nc>>(m, "UmapENC");
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m.def("get_umnc", ×_ten<std::unordered_map<int, E_nc>>, py::return_value_policy::reference);
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});
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