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Adding documentation for value_error. Fixing various formatting issues. Removing redundant binding for C++ style methods. Adding bindings for iterator and slicing protocol. Extending examples.

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This commit is contained in:
Sergey Lyskov 2016-05-08 19:31:55 -04:00 committed by Wenzel Jakob
parent 25ac21903a
commit a95bde1ea5
5 changed files with 121 additions and 61 deletions
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5
docs/advanced.rst
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@ -779,6 +779,10 @@ exceptions:
| | accesses in ``__getitem__``, |
| | ``__setitem__``, etc.) |
+--------------------------------------+------------------------------+
| :class:`pybind11::value_error` | ``ValueError`` (used to |
| | indicate wrong value passed |
| | in ``container.remove(...)`` |
+--------------------------------------+------------------------------+
| :class:`pybind11::error_already_set` | Indicates that the Python |
| | exception flag has already |
| | been initialized |
@ -1531,4 +1535,3 @@ work, it is important that all lines are indented consistently, i.e.:
.. [#f4] http://www.sphinx-doc.org
.. [#f5] http://github.com/pybind/pbtest

28
example/example17.cpp
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@ -1,5 +1,5 @@
/*
example/example17.cpp -- Usade of stl_binders functions
example/example17.cpp -- Usage of stl_binders functions
Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
@ -11,17 +11,27 @@
#include <pybind11/stl_binders.h>
class A
{
class A {
public:
A() = delete;
A(int v) :a(v) {}
int a;
};
void init_ex17(py::module &m)
{
pybind11::class_<A>(m, "A");
py::vector_binder<int>(m, "VectorInt");
py::vector_binder<A>(m, "VectorA");
std::ostream & operator<<(std::ostream &s, A const&v) {
s << "A{" << v.a << '}';
return s;
}
void init_ex17(py::module &m) {
pybind11::class_<A>(m, "A")
.def(pybind11::init<int>());
pybind11::vector_binder<int>(m, "VectorInt");
pybind11::vector_binder<A>(m, "VectorA");
}

21
example/example17.py
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@ -1,24 +1,31 @@
#!/usr/bin/env python
from __future__ import print_function
from example import VectorInt, VectorA
from example import VectorInt, VectorA, A
v_int = VectorInt(2)
print( v_int.size() )
print(len(v_int))
print( bool(v_int) )
print(bool(v_int))
v_int2 = VectorInt(2)
print( v_int == v_int2 )
print(v_int == v_int2)
v_int2[1] = 1
print( v_int != v_int2 )
print(v_int != v_int2)
v_int2.push_back(2)
v_int2.push_back(3)
v_int2.append(2)
v_int2.append(3)
v_int2.insert(0, 1)
v_int2.insert(0, 2)
v_int2.insert(0, 3)
print(v_int2)
v_int.append(99)
v_int2[2:-2] = v_int
print(v_int2)
v_a = VectorA()
v_a.append(A(1))
v_a.append(A(2))
print(v_a)

6
example/example17.ref
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@ -3,3 +3,9 @@ True
True
True
VectorInt[3, 2, 1, 0, 1, 2, 3]
VectorInt[3, 2, 0, 0, 99, 2, 3]
A constructor
A destructor
A constructor
A destructor
VectorA[A{1}, A{2}]

122
include/pybind11/stl_binders.h
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@ -27,14 +27,14 @@ NAMESPACE_BEGIN(pybind11)
template<typename T>
constexpr auto has_equal_operator(int) -> decltype( std::declval<T>() == std::declval<T>(), bool()) { return true; }
constexpr auto has_equal_operator(int) -> decltype(std::declval<T>() == std::declval<T>(), bool()) { return true; }
template<typename T>
constexpr bool has_equal_operator(...) { return false; }
template<typename T>
constexpr auto has_not_equal_operator(int) -> decltype( std::declval<T>() != std::declval<T>(), bool()) { return true; }
constexpr auto has_not_equal_operator(int) -> decltype(std::declval<T>() != std::declval<T>(), bool()) { return true; }
template<typename T>
constexpr bool has_not_equal_operator(...) { return false; }
@ -43,22 +43,20 @@ constexpr bool has_not_equal_operator(...) { return false; }
namespace has_insertion_operator_implementation {
enum class False {};
struct any_type {
template<typename T> any_type( T const& );
template<typename T> any_type(T const&);
};
False operator<<( std::ostream const&, any_type const& );
False operator<<(std::ostream const&, any_type const&);
}
template<typename T>
constexpr bool has_insertion_operator()
{
constexpr bool has_insertion_operator() {
using namespace has_insertion_operator_implementation;
return std::is_same< decltype( std::declval<std::ostringstream&>() << std::declval<T>() ), std::ostream & >::value;
return std::is_same< decltype(std::declval<std::ostream&>() << std::declval<T>()), std::ostream & >::value;
}
#endif
template <typename T, typename Allocator = std::allocator<T>, typename holder_type = std::unique_ptr< std::vector<T, Allocator> > >
class vector_binder
{
class vector_binder {
using Vector = std::vector<T, Allocator>;
using SizeType = typename Vector::size_type;
@ -72,16 +70,28 @@ class vector_binder
// void maybe_constructible(Class_ &cl) {}
template<typename U = T, typename std::enable_if< std::is_default_constructible<U>{} >::type * = nullptr>
void maybe_default_constructible(Class_ &cl) {
void maybe_default_constructible() {
cl.def(pybind11::init<SizeType>());
cl.def("resize", (void (Vector::*)(SizeType count)) &Vector::resize, "changes the number of elements stored");
/// Slicing protocol
cl.def("__getitem__", [](Vector const &v, pybind11::slice slice) -> Vector * {
pybind11::ssize_t start, stop, step, slicelength;
if(!slice.compute(v.size(), &start, &stop, &step, &slicelength))
throw pybind11::error_already_set();
Vector *seq = new Vector(slicelength);
for (int i=0; i<slicelength; ++i) {
(*seq)[i] = v[start]; start += step;
}
return seq;
});
}
template<typename U = T, typename std::enable_if< !std::is_default_constructible<U>{} >::type * = nullptr>
void maybe_default_constructible(Class_ &) {}
void maybe_default_constructible() {}
template<typename U = T, typename std::enable_if< std::is_copy_constructible<U>{} >::type * = nullptr>
void maybe_copy_constructible(Class_ &cl) {
void maybe_copy_constructible() {
cl.def(pybind11::init< Vector const &>());
}
template<typename U = T, typename std::enable_if< !std::is_copy_constructible<U>{} >::type * = nullptr>
@ -89,39 +99,41 @@ class vector_binder
template<typename U = T, typename std::enable_if< has_equal_operator<U>(0) >::type * = nullptr>
void maybe_has_equal_operator(Class_ &cl) {
void maybe_has_equal_operator() {
cl.def(pybind11::self == pybind11::self);
cl.def(pybind11::self != pybind11::self);
cl.def("count", [](Vector const &v, T const & value) { return std::count(v.begin(), v.end(), value); }, "counts the elements that are equal to value");
cl.def("remove", [](Vector &v, const T&t) {
cl.def("remove", [](Vector &v, T const &t) {
auto p = std::find(v.begin(), v.end(), t);
if( p != v.end() ) v.erase(p);
if(p != v.end()) v.erase(p);
else throw pybind11::value_error();
}, "Remove the first item from the list whose value is x. It is an error if there is no such item.");
cl.def("__contains__", [](Vector const &v, T const &t) { return std::find(v.begin(), v.end(), t) != v.end(); }, "return true if item in the container");
}
template<typename U = T, typename std::enable_if< !has_equal_operator<U>(0) >::type * = nullptr>
void maybe_has_equal_operator(Class_ &) {}
void maybe_has_equal_operator() {}
template<typename U = T, typename std::enable_if< has_not_equal_operator<U>(0) >::type * = nullptr>
void maybe_has_not_equal_operator(Class_ &cl) {
void maybe_has_not_equal_operator() {
cl.def(pybind11::self != pybind11::self);
}
template<typename U = T, typename std::enable_if< !has_not_equal_operator<U>(0) >::type * = nullptr>
void maybe_has_not_equal_operator(Class_ &) {}
void maybe_has_not_equal_operator() {}
#ifdef INSERTION_OPERATOR_IMPLEMENTATION
template<typename U = T, typename std::enable_if< has_insertion_operator<U>() >::type * = nullptr>
void maybe_has_insertion_operator(Class_ &cl, std::string name) {
void maybe_has_insertion_operator(char const *name) {
cl.def("__repr__", [name](typename vector_binder<T>::Vector &v) {
std::ostringstream s;
s << name << '[';
for(uint i=0; i<v.size(); ++i) {
s << v[i];
if( i != v.size() -1 ) s << ", ";
if(i != v.size()-1) s << ", ";
}
s << ']';
return s.str();
@ -129,64 +141,65 @@ class vector_binder
}
template<typename U = T, typename std::enable_if< !has_insertion_operator<U>() >::type * = nullptr>
void maybe_has_insertion_operator(Class_ &, char const *) {}
void maybe_has_insertion_operator(char const *) {}
#endif
public:
vector_binder(pybind11::module &m, char const *name) {
Class_ cl(m, name);
Class_ cl;
vector_binder(pybind11::module &m, char const *name, char const *doc=nullptr) : cl(m, name, doc) {
cl.def(pybind11::init<>());
//maybe_constructible(cl);
maybe_default_constructible(cl);
maybe_copy_constructible(cl);
maybe_default_constructible();
maybe_copy_constructible();
// Element access
cl.def("front", [](Vector &v) {
if( v.size() ) return v.front();
if(v.size()) return v.front();
else throw pybind11::index_error();
}, "access the first element");
cl.def("back", [](Vector &v) {
if( v.size() ) return v.back();
if(v.size()) return v.back();
else throw pybind11::index_error();
}, "access the last element ");
// Not needed, the operator[] is already providing bounds checking cl.def("at", (T& (Vector::*)(SizeType i)) &Vector::at, "access specified element with bounds checking");
// Capacity
cl.def("empty", &Vector::empty, "checks whether the container is empty");
cl.def("size", &Vector::size, "returns the number of elements");
// Capacity, C++ style
cl.def("max_size", &Vector::max_size, "returns the maximum possible number of elements");
cl.def("reserve", &Vector::reserve, "reserves storage");
cl.def("capacity", &Vector::capacity, "returns the number of elements that can be held in currently allocated storage");
cl.def("shrink_to_fit", &Vector::shrink_to_fit, "reduces memory usage by freeing unused memory");
// Modifiers, C++ style
cl.def("clear", &Vector::clear, "clears the contents");
cl.def("push_back", (void (Vector::*)(const T&)) &Vector::push_back, "adds an element to the end");
cl.def("pop_back", &Vector::pop_back, "removes the last element");
cl.def("swap", &Vector::swap, "swaps the contents");
cl.def("clear", &Vector::clear, "clears the contents");
cl.def("swap", &Vector::swap, "swaps the contents");
// Modifiers, Python style
cl.def("append", (void (Vector::*)(const T&)) &Vector::push_back, "adds an element to the end");
cl.def("insert", [](Vector &v, SizeType i, const T&t) {v.insert(v.begin()+i, t);}, "insert an item at a given position");
cl.def("pop", [](Vector &v) {
if( v.size() ) {
if(v.size()) {
T t = v.back();
v.pop_back();
return t;
}
else throw pybind11::index_error();
}, "insert an item at a given position");
}, "remove and return last item");
cl.def("pop", [](Vector &v, SizeType i) {
if(i >= v.size()) throw pybind11::index_error();
T t = v[i];
v.erase(v.begin() + i);
return t;
}, "remove and return item at index");
cl.def("erase", [](Vector &v, SizeType i) {
if( i >= v.size() ) throw pybind11::index_error();
v.erase( v.begin() + i );
if(i >= v.size()) throw pybind11::index_error();
v.erase(v.begin() + i);
}, "erases element at index");
@ -198,25 +211,46 @@ public:
#endif
cl.def("__getitem__", [](Vector const &v, SizeType i) {
if( i >= v.size() ) throw pybind11::index_error();
if(i >= v.size()) throw pybind11::index_error();
return v[i];
});
cl.def("__setitem__", [](Vector &v, SizeType i, T const & t) {
if( i >= v.size() ) throw pybind11::index_error();
if(i >= v.size()) throw pybind11::index_error();
v[i] = t;
});
cl.def("__len__", &Vector::size);
cl.def("__iter__", [](Vector &v) { return pybind11::make_iterator(v.begin(), v.end()); },
pybind11::keep_alive<0, 1>() /* Essential: keep object alive while iterator exists */);
/// Slicing protocol
cl.def("__setitem__", [](Vector &v, pybind11::slice slice, Vector const &value) {
pybind11::ssize_t start, stop, step, slicelength;
if(!slice.compute(v.size(), &start, &stop, &step, &slicelength))
throw pybind11::error_already_set();
if((size_t) slicelength != value.size())
throw std::runtime_error("Left and right hand size of slice assignment have different sizes!");
for(int i=0; i<slicelength; ++i) {
v[start] = value[i]; start += step;
}
});
// Comparisons
maybe_has_equal_operator(cl);
maybe_has_not_equal_operator(cl);
maybe_has_equal_operator();
maybe_has_not_equal_operator();
// Printing
#ifdef INSERTION_OPERATOR_IMPLEMENTATION
maybe_has_insertion_operator(cl, name);
maybe_has_insertion_operator(name);
#endif
// C++ style functions deprecated, leaving it here as an example
//cl.def("empty", &Vector::empty, "checks whether the container is empty");
//cl.def("size", &Vector::size, "returns the number of elements");
//cl.def("push_back", (void (Vector::*)(const T&)) &Vector::push_back, "adds an element to the end");
//cl.def("pop_back", &Vector::pop_back, "removes the last element");
}
};