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worked on #91

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- implemented `get_ptr` function to return pointer to value member
- overworked `get` function to support pointer types
- added test cases
- added documentation (see
http://nlohmann.github.io/json/classnlohmann_1_1basic__json.html) with
examples
This commit is contained in:
Niels
2015-06-24 15:16:32 +02:00
parent 457572184c
commit 40312fb07b
11 changed files with 698 additions and 18 deletions
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180
test/unit.cpp
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@ -2434,6 +2434,186 @@ TEST_CASE("value conversion")
}
}
TEST_CASE("pointer access")
{
// create a JSON value with different types
json json_types =
{
{"boolean", true},
{
"number", {
{"integer", 42},
{"floating-point", 17.23}
}
},
{"string", "Hello, world!"},
{"array", {1, 2, 3, 4, 5}},
{"null", nullptr}
};
SECTION("pointer access to object_t")
{
using test_type = json::object_t;
json value = {{"one", 1}, {"two", 2}};
// check if pointers are returned correctly
test_type* p1 = value.get_ptr<test_type*>();
CHECK(p1 == value.get_ptr<test_type*>());
CHECK(*p1 == value.get<test_type>());
const test_type* p2 = value.get_ptr<const test_type*>();
CHECK(p1 == value.get_ptr<const test_type*>());
CHECK(*p2 == value.get<test_type>());
const test_type* const p3 = value.get_ptr<const test_type* const>();
CHECK(p1 == value.get_ptr<const test_type* const>());
CHECK(*p3 == value.get<test_type>());
// check if null pointers are returned correctly
CHECK(value.get_ptr<json::object_t*>() != nullptr);
CHECK(value.get_ptr<json::array_t*>() == nullptr);
CHECK(value.get_ptr<json::string_t*>() == nullptr);
CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
}
SECTION("pointer access to array_t")
{
using test_type = json::array_t;
json value = {1, 2, 3, 4};
// check if pointers are returned correctly
test_type* p1 = value.get_ptr<test_type*>();
CHECK(p1 == value.get_ptr<test_type*>());
CHECK(*p1 == value.get<test_type>());
const test_type* p2 = value.get_ptr<const test_type*>();
CHECK(p1 == value.get_ptr<const test_type*>());
CHECK(*p2 == value.get<test_type>());
const test_type* const p3 = value.get_ptr<const test_type* const>();
CHECK(p1 == value.get_ptr<const test_type* const>());
CHECK(*p3 == value.get<test_type>());
// check if null pointers are returned correctly
CHECK(value.get_ptr<json::object_t*>() == nullptr);
CHECK(value.get_ptr<json::array_t*>() != nullptr);
CHECK(value.get_ptr<json::string_t*>() == nullptr);
CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
}
SECTION("pointer access to string_t")
{
using test_type = json::string_t;
json value = "hello";
// check if pointers are returned correctly
test_type* p1 = value.get_ptr<test_type*>();
CHECK(p1 == value.get_ptr<test_type*>());
CHECK(*p1 == value.get<test_type>());
const test_type* p2 = value.get_ptr<const test_type*>();
CHECK(p1 == value.get_ptr<const test_type*>());
CHECK(*p2 == value.get<test_type>());
const test_type* const p3 = value.get_ptr<const test_type* const>();
CHECK(p1 == value.get_ptr<const test_type* const>());
CHECK(*p3 == value.get<test_type>());
// check if null pointers are returned correctly
CHECK(value.get_ptr<json::object_t*>() == nullptr);
CHECK(value.get_ptr<json::array_t*>() == nullptr);
CHECK(value.get_ptr<json::string_t*>() != nullptr);
CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
}
SECTION("pointer access to boolean_t")
{
using test_type = json::boolean_t;
json value = false;
// check if pointers are returned correctly
test_type* p1 = value.get_ptr<test_type*>();
CHECK(p1 == value.get_ptr<test_type*>());
CHECK(*p1 == value.get<test_type>());
const test_type* p2 = value.get_ptr<const test_type*>();
CHECK(p1 == value.get_ptr<const test_type*>());
CHECK(*p2 == value.get<test_type>());
const test_type* const p3 = value.get_ptr<const test_type* const>();
CHECK(p1 == value.get_ptr<const test_type* const>());
CHECK(*p3 == value.get<test_type>());
// check if null pointers are returned correctly
CHECK(value.get_ptr<json::object_t*>() == nullptr);
CHECK(value.get_ptr<json::array_t*>() == nullptr);
CHECK(value.get_ptr<json::string_t*>() == nullptr);
CHECK(value.get_ptr<json::boolean_t*>() != nullptr);
CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
}
SECTION("pointer access to number_integer_t")
{
using test_type = json::number_integer_t;
json value = 23;
// check if pointers are returned correctly
test_type* p1 = value.get_ptr<test_type*>();
CHECK(p1 == value.get_ptr<test_type*>());
CHECK(*p1 == value.get<test_type>());
const test_type* p2 = value.get_ptr<const test_type*>();
CHECK(p1 == value.get_ptr<const test_type*>());
CHECK(*p2 == value.get<test_type>());
const test_type* const p3 = value.get_ptr<const test_type* const>();
CHECK(p1 == value.get_ptr<const test_type* const>());
CHECK(*p3 == value.get<test_type>());
// check if null pointers are returned correctly
CHECK(value.get_ptr<json::object_t*>() == nullptr);
CHECK(value.get_ptr<json::array_t*>() == nullptr);
CHECK(value.get_ptr<json::string_t*>() == nullptr);
CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
CHECK(value.get_ptr<json::number_integer_t*>() != nullptr);
CHECK(value.get_ptr<json::number_float_t*>() == nullptr);
}
SECTION("pointer access to number_float_t")
{
using test_type = json::number_float_t;
json value = 42.23;
// check if pointers are returned correctly
test_type* p1 = value.get_ptr<test_type*>();
CHECK(p1 == value.get_ptr<test_type*>());
CHECK(*p1 == Approx(value.get<test_type>()));
const test_type* p2 = value.get_ptr<const test_type*>();
CHECK(p1 == value.get_ptr<const test_type*>());
CHECK(*p2 == Approx(value.get<test_type>()));
const test_type* const p3 = value.get_ptr<const test_type* const>();
CHECK(p1 == value.get_ptr<const test_type* const>());
CHECK(*p3 == Approx(value.get<test_type>()));
// check if null pointers are returned correctly
CHECK(value.get_ptr<json::object_t*>() == nullptr);
CHECK(value.get_ptr<json::array_t*>() == nullptr);
CHECK(value.get_ptr<json::string_t*>() == nullptr);
CHECK(value.get_ptr<json::boolean_t*>() == nullptr);
CHECK(value.get_ptr<json::number_integer_t*>() == nullptr);
CHECK(value.get_ptr<json::number_float_t*>() != nullptr);
}
}
TEST_CASE("element access")
{
SECTION("array")