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Added Support for Structured Bindings

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For further details, read https://github.com/nlohmann/json/issues/1388 and https://blog.tartanllama.xyz/structured-bindings/
This commit is contained in:
Pratik Chowdhury
2018-12-19 20:17:35 +05:30
parent e73dfef6e5
commit ebd3f45808
6 changed files with 337 additions and 248 deletions
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101
test/src/unit-items.cpp
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@ -3,21 +3,17 @@
__| | __| | | | JSON for Modern C++ (test suite)
| | |__ | | | | | | version 3.4.0
|_____|_____|_____|_|___| https://github.com/nlohmann/json
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2013-2018 Niels Lohmann <http://nlohmann.me>.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@ -32,13 +28,20 @@ SOFTWARE.
#include <nlohmann/json.hpp>
using nlohmann::json;
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
#define JSON_HAS_CPP_17
#define JSON_HAS_CPP_14
#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
#define JSON_HAS_CPP_14
#endif
TEST_CASE("iterator_wrapper")
{
SECTION("object")
{
SECTION("value")
{
json j = {{"A", 1}, {"B", 2}};
json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (auto i : json::iterator_wrapper(j))
@ -71,7 +74,7 @@ TEST_CASE("iterator_wrapper")
SECTION("reference")
{
json j = {{"A", 1}, {"B", 2}};
json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (auto& i : json::iterator_wrapper(j))
@ -110,12 +113,12 @@ TEST_CASE("iterator_wrapper")
CHECK(counter == 3);
// check if values where changed
CHECK(j == json({{"A", 11}, {"B", 22}}));
CHECK(j == json({ {"A", 11}, {"B", 22} }));
}
SECTION("const value")
{
json j = {{"A", 1}, {"B", 2}};
json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (const auto i : json::iterator_wrapper(j))
@ -148,7 +151,7 @@ TEST_CASE("iterator_wrapper")
SECTION("const reference")
{
json j = {{"A", 1}, {"B", 2}};
json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (const auto& i : json::iterator_wrapper(j))
@ -184,7 +187,7 @@ TEST_CASE("iterator_wrapper")
{
SECTION("value")
{
const json j = {{"A", 1}, {"B", 2}};
const json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (auto i : json::iterator_wrapper(j))
@ -217,7 +220,7 @@ TEST_CASE("iterator_wrapper")
SECTION("reference")
{
const json j = {{"A", 1}, {"B", 2}};
const json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (auto& i : json::iterator_wrapper(j))
@ -250,7 +253,7 @@ TEST_CASE("iterator_wrapper")
SECTION("const value")
{
const json j = {{"A", 1}, {"B", 2}};
const json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (const auto i : json::iterator_wrapper(j))
@ -283,7 +286,7 @@ TEST_CASE("iterator_wrapper")
SECTION("const reference")
{
const json j = {{"A", 1}, {"B", 2}};
const json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (const auto& i : json::iterator_wrapper(j))
@ -319,7 +322,7 @@ TEST_CASE("iterator_wrapper")
{
SECTION("value")
{
json j = {"A", "B"};
json j = { "A", "B" };
int counter = 1;
for (auto i : json::iterator_wrapper(j))
@ -352,7 +355,7 @@ TEST_CASE("iterator_wrapper")
SECTION("reference")
{
json j = {"A", "B"};
json j = { "A", "B" };
int counter = 1;
for (auto& i : json::iterator_wrapper(j))
@ -391,12 +394,12 @@ TEST_CASE("iterator_wrapper")
CHECK(counter == 3);
// check if values where changed
CHECK(j == json({"AA", "BB"}));
CHECK(j == json({ "AA", "BB" }));
}
SECTION("const value")
{
json j = {"A", "B"};
json j = { "A", "B" };
int counter = 1;
for (const auto i : json::iterator_wrapper(j))
@ -429,7 +432,7 @@ TEST_CASE("iterator_wrapper")
SECTION("const reference")
{
json j = {"A", "B"};
json j = { "A", "B" };
int counter = 1;
for (const auto& i : json::iterator_wrapper(j))
@ -465,7 +468,7 @@ TEST_CASE("iterator_wrapper")
{
SECTION("value")
{
const json j = {"A", "B"};
const json j = { "A", "B" };
int counter = 1;
for (auto i : json::iterator_wrapper(j))
@ -498,7 +501,7 @@ TEST_CASE("iterator_wrapper")
SECTION("reference")
{
const json j = {"A", "B"};
const json j = { "A", "B" };
int counter = 1;
for (auto& i : json::iterator_wrapper(j))
@ -531,7 +534,7 @@ TEST_CASE("iterator_wrapper")
SECTION("const value")
{
const json j = {"A", "B"};
const json j = { "A", "B" };
int counter = 1;
for (const auto i : json::iterator_wrapper(j))
@ -564,7 +567,7 @@ TEST_CASE("iterator_wrapper")
SECTION("const reference")
{
const json j = {"A", "B"};
const json j = { "A", "B" };
int counter = 1;
for (const auto& i : json::iterator_wrapper(j))
@ -735,7 +738,7 @@ TEST_CASE("items()")
{
SECTION("value")
{
json j = {{"A", 1}, {"B", 2}};
json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (auto i : j.items())
@ -768,7 +771,7 @@ TEST_CASE("items()")
SECTION("reference")
{
json j = {{"A", 1}, {"B", 2}};
json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (auto& i : j.items())
@ -807,12 +810,12 @@ TEST_CASE("items()")
CHECK(counter == 3);
// check if values where changed
CHECK(j == json({{"A", 11}, {"B", 22}}));
CHECK(j == json({ {"A", 11}, {"B", 22} }));
}
SECTION("const value")
{
json j = {{"A", 1}, {"B", 2}};
json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (const auto i : j.items())
@ -845,7 +848,7 @@ TEST_CASE("items()")
SECTION("const reference")
{
json j = {{"A", 1}, {"B", 2}};
json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (const auto& i : j.items())
@ -875,13 +878,29 @@ TEST_CASE("items()")
CHECK(counter == 3);
}
#ifdef JSON_HAS_CPP_17
SECTION("structured bindings")
{
json j = { {"A", 1}, {"B", 2} };
std::map<std::string, int> m;
for (auto const&[key, value] : j.items())
{
m.emplace(key, value);
}
CHECK(j.get<decltype(m)>() == m);
}
#endif
}
SECTION("const object")
{
SECTION("value")
{
const json j = {{"A", 1}, {"B", 2}};
const json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (auto i : j.items())
@ -914,7 +933,7 @@ TEST_CASE("items()")
SECTION("reference")
{
const json j = {{"A", 1}, {"B", 2}};
const json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (auto& i : j.items())
@ -947,7 +966,7 @@ TEST_CASE("items()")
SECTION("const value")
{
const json j = {{"A", 1}, {"B", 2}};
const json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (const auto i : j.items())
@ -980,7 +999,7 @@ TEST_CASE("items()")
SECTION("const reference")
{
const json j = {{"A", 1}, {"B", 2}};
const json j = { {"A", 1}, {"B", 2} };
int counter = 1;
for (const auto& i : j.items())
@ -1016,7 +1035,7 @@ TEST_CASE("items()")
{
SECTION("value")
{
json j = {"A", "B"};
json j = { "A", "B" };
int counter = 1;
for (auto i : j.items())
@ -1049,7 +1068,7 @@ TEST_CASE("items()")
SECTION("reference")
{
json j = {"A", "B"};
json j = { "A", "B" };
int counter = 1;
for (auto& i : j.items())
@ -1088,12 +1107,12 @@ TEST_CASE("items()")
CHECK(counter == 3);
// check if values where changed
CHECK(j == json({"AA", "BB"}));
CHECK(j == json({ "AA", "BB" }));
}
SECTION("const value")
{
json j = {"A", "B"};
json j = { "A", "B" };
int counter = 1;
for (const auto i : j.items())
@ -1126,7 +1145,7 @@ TEST_CASE("items()")
SECTION("const reference")
{
json j = {"A", "B"};
json j = { "A", "B" };
int counter = 1;
for (const auto& i : j.items())
@ -1162,7 +1181,7 @@ TEST_CASE("items()")
{
SECTION("value")
{
const json j = {"A", "B"};
const json j = { "A", "B" };
int counter = 1;
for (auto i : j.items())
@ -1195,7 +1214,7 @@ TEST_CASE("items()")
SECTION("reference")
{
const json j = {"A", "B"};
const json j = { "A", "B" };
int counter = 1;
for (auto& i : j.items())
@ -1228,7 +1247,7 @@ TEST_CASE("items()")
SECTION("const value")
{
const json j = {"A", "B"};
const json j = { "A", "B" };
int counter = 1;
for (const auto i : j.items())
@ -1261,7 +1280,7 @@ TEST_CASE("items()")
SECTION("const reference")
{
const json j = {"A", "B"};
const json j = { "A", "B" };
int counter = 1;
for (const auto& i : j.items())
@ -1424,4 +1443,4 @@ TEST_CASE("items()")
CHECK(counter == 2);
}
}
}
}