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🐛 re-added support for std::valarray #702

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Niels Lohmann 2017-08-22 23:28:23 +02:00
parent 41b2c69bdb
commit 9fd031b6f4
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GPG key ID: 7F3CEA63AE251B69
4 changed files with 113 additions and 5 deletions
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36
src/json.hpp
View file

@ -54,6 +54,7 @@ SOFTWARE.
#include <string> // getline, stoi, string, to_string
#include <type_traits> // add_pointer, conditional, decay, enable_if, false_type, integral_constant, is_arithmetic, is_base_of, is_const, is_constructible, is_convertible, is_default_constructible, is_enum, is_floating_point, is_integral, is_nothrow_move_assignable, is_nothrow_move_constructible, is_pointer, is_reference, is_same, is_scalar, is_signed, remove_const, remove_cv, remove_pointer, remove_reference, true_type, underlying_type
#include <utility> // declval, forward, make_pair, move, pair, swap
#include <valarray> // valarray
#include <vector> // vector
// exclude unsupported compilers
@ -661,6 +662,18 @@ struct external_constructor<value_t::array>
}
j.assert_invariant();
}
template<typename BasicJsonType, typename T,
enable_if_t<std::is_convertible<T, BasicJsonType>::value, int> = 0>
static void construct(BasicJsonType& j, const std::valarray<T>& arr)
{
using std::begin;
using std::end;
j.m_type = value_t::array;
j.m_value = value_t::array;
j.m_value.array = j.template create<typename BasicJsonType::array_t>(begin(arr), end(arr));
j.assert_invariant();
}
};
template<>
@ -926,6 +939,13 @@ void to_json(BasicJsonType& j, const CompatibleArrayType& arr)
external_constructor<value_t::array>::construct(j, arr);
}
template <typename BasicJsonType, typename T,
enable_if_t<std::is_convertible<T, BasicJsonType>::value, int> = 0>
void to_json(BasicJsonType& j, std::valarray<T> arr)
{
external_constructor<value_t::array>::construct(j, std::move(arr));
}
template <typename BasicJsonType>
void to_json(BasicJsonType& j, typename BasicJsonType::array_t&& arr)
{
@ -1082,6 +1102,22 @@ void from_json(const BasicJsonType& j, std::forward_list<T, Allocator>& l)
});
}
// valarray doesn't have an insert method
template<typename BasicJsonType, typename T,
enable_if_t<std::is_convertible<BasicJsonType, T>::value, int> = 0>
void from_json(const BasicJsonType& j, std::valarray<T>& l)
{
if (JSON_UNLIKELY(not j.is_array()))
{
JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
}
l.resize(j.size());
for (size_t i = 0; i < j.size(); ++i)
{
l[i] = j[i];
}
}
template<typename BasicJsonType, typename CompatibleArrayType>
void from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, priority_tag<0> /*unused*/)
{

31
test/src/unit-constructor1.cpp
View file

@ -38,6 +38,7 @@ using nlohmann::json;
#include <list>
#include <unordered_map>
#include <unordered_set>
#include <valarray>
TEST_CASE("constructors")
{
@ -311,6 +312,36 @@ TEST_CASE("constructors")
CHECK(a2 == a);
}
SECTION("std::valarray<int>")
{
std::valarray<int> va = {1, 2, 3, 4, 5};
json j(va);
CHECK(j.type() == json::value_t::array);
CHECK(j == json({1, 2, 3, 4, 5}));
std::valarray<int> jva = j;
CHECK(jva.size() == va.size());
for (size_t i = 0; i < jva.size(); ++i)
{
CHECK(va[i] == jva[i]);
}
}
SECTION("std::valarray<double>")
{
std::valarray<double> va = {1.2, 2.3, 3.4, 4.5, 5.6};
json j(va);
CHECK(j.type() == json::value_t::array);
CHECK(j == json({1.2, 2.3, 3.4, 4.5, 5.6}));
std::valarray<double> jva = j;
CHECK(jva.size() == va.size());
for (size_t i = 0; i < jva.size(); ++i)
{
CHECK(va[i] == jva[i]);
}
}
SECTION("std::vector<json>")
{
std::vector<json> a {json(1), json(1u), json(2.2), json(false), json("string"), json()};

12
test/src/unit-conversions.cpp
View file

@ -37,6 +37,7 @@ using nlohmann::json;
#include <list>
#include <unordered_map>
#include <unordered_set>
#include <valarray>
TEST_CASE("value conversion")
{
@ -1008,6 +1009,15 @@ TEST_CASE("value conversion")
auto m5 = j5.get<std::forward_list<std::string>>();
}
SECTION("std::valarray")
{
auto m1 = j1.get<std::valarray<int>>();
auto m2 = j2.get<std::valarray<unsigned int>>();
auto m3 = j3.get<std::valarray<double>>();
auto m4 = j4.get<std::valarray<bool>>();
auto m5 = j5.get<std::valarray<std::string>>();
}
SECTION("std::vector")
{
auto m1 = j1.get<std::vector<int>>();
@ -1050,6 +1060,7 @@ TEST_CASE("value conversion")
CHECK_THROWS_AS((json().get<std::vector<int>>()), json::type_error&);
CHECK_THROWS_AS((json().get<std::vector<json>>()), json::type_error&);
CHECK_THROWS_AS((json().get<std::list<json>>()), json::type_error&);
CHECK_THROWS_AS((json().get<std::valarray<int>>()), json::type_error&);
// does type really must be an array? or it rather must not be null?
// that's what I thought when other test like this one broke
@ -1057,6 +1068,7 @@ TEST_CASE("value conversion")
CHECK_THROWS_WITH((json().get<std::vector<int>>()), "[json.exception.type_error.302] type must be array, but is null");
CHECK_THROWS_WITH((json().get<std::vector<json>>()), "[json.exception.type_error.302] type must be array, but is null");
CHECK_THROWS_WITH((json().get<std::list<json>>()), "[json.exception.type_error.302] type must be array, but is null");
CHECK_THROWS_WITH((json().get<std::valarray<int>>()), "[json.exception.type_error.302] type must be array, but is null");
}
}
}

29
test/src/unit-regression.cpp
View file

@ -1204,4 +1204,33 @@ TEST_CASE("regression tests")
std::string i = "\xef\xbb\xbf{\n \"foo\": true\n}";
CHECK_NOTHROW(json::parse(i.begin(), i.end()));
}
SECTION("issue #702 - conversion from valarray<double> to json fails to build")
{
SECTION("original example")
{
std::valarray<double> v;
nlohmann::json j;
j["test"] = v;
}
SECTION("full example")
{
std::valarray<double> v = {1.2, 2.3, 3.4, 4.5};
json j = v;
std::valarray<double> vj = j;
CHECK(j == json(vj));
CHECK(v.size() == vj.size());
for (size_t i = 0; i < v.size(); ++i)
{
CHECK(v[i] == vj[i]);
CHECK(v[i] == j[i]);
}
CHECK_THROWS_AS(json().get<std::valarray<double>>(), json::type_error&);
CHECK_THROWS_WITH(json().get<std::valarray<double>>(),
"[json.exception.type_error.302] type must be array, but is null");
}
}
}