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Make json_pointer usable as map key (again) (#3685)

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* Make json_pointer usable as map key

* Add unit tests
This commit is contained in:
Florian Albrechtskirchinger 2022-08-07 14:35:40 +02:00 committed by GitHub
parent 231f3108ff
commit 31265dc69c
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3 changed files with 71 additions and 4 deletions
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24
include/nlohmann/detail/json_pointer.hpp
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@ -847,7 +847,7 @@ class json_pointer
}
public:
#ifdef JSON_HAS_CPP_20
#if JSON_HAS_THREE_WAY_COMPARISON
/// @brief compares two JSON pointers for equality
/// @sa https://json.nlohmann.me/api/json_pointer/operator_eq/
template<typename RefStringTypeRhs>
@ -862,6 +862,13 @@ class json_pointer
{
return *this == json_pointer(rhs);
}
/// @brief 3-way compares two JSON pointers
template<typename RefStringTypeRhs>
std::strong_ordering operator<=>(const json_pointer<RefStringTypeRhs>& rhs) const noexcept // *NOPAD*
{
return reference_tokens <=> rhs.reference_tokens; // *NOPAD*
}
#else
/// @brief compares two JSON pointers for equality
/// @sa https://json.nlohmann.me/api/json_pointer/operator_eq/
@ -904,6 +911,12 @@ class json_pointer
// NOLINTNEXTLINE(readability-redundant-declaration)
friend bool operator!=(const StringType& lhs,
const json_pointer<RefStringTypeRhs>& rhs);
/// @brief compares two JSON pointer for less-than
template<typename RefStringTypeLhs, typename RefStringTypeRhs>
// NOLINTNEXTLINE(readability-redundant-declaration)
friend bool operator<(const json_pointer<RefStringTypeLhs>& lhs,
const json_pointer<RefStringTypeRhs>& rhs) noexcept;
#endif
private:
@ -911,7 +924,7 @@ class json_pointer
std::vector<string_t> reference_tokens;
};
#ifndef JSON_HAS_CPP_20
#if !JSON_HAS_THREE_WAY_COMPARISON
// functions cannot be defined inside class due to ODR violations
template<typename RefStringTypeLhs, typename RefStringTypeRhs>
inline bool operator==(const json_pointer<RefStringTypeLhs>& lhs,
@ -958,6 +971,13 @@ inline bool operator!=(const StringType& lhs,
{
return !(lhs == rhs);
}
template<typename RefStringTypeLhs, typename RefStringTypeRhs>
inline bool operator<(const json_pointer<RefStringTypeLhs>& lhs,
const json_pointer<RefStringTypeRhs>& rhs) noexcept
{
return lhs.reference_tokens < rhs.reference_tokens;
}
#endif
NLOHMANN_JSON_NAMESPACE_END

24
single_include/nlohmann/json.hpp
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@ -14507,7 +14507,7 @@ class json_pointer
}
public:
#ifdef JSON_HAS_CPP_20
#if JSON_HAS_THREE_WAY_COMPARISON
/// @brief compares two JSON pointers for equality
/// @sa https://json.nlohmann.me/api/json_pointer/operator_eq/
template<typename RefStringTypeRhs>
@ -14522,6 +14522,13 @@ class json_pointer
{
return *this == json_pointer(rhs);
}
/// @brief 3-way compares two JSON pointers
template<typename RefStringTypeRhs>
std::strong_ordering operator<=>(const json_pointer<RefStringTypeRhs>& rhs) const noexcept // *NOPAD*
{
return reference_tokens <=> rhs.reference_tokens; // *NOPAD*
}
#else
/// @brief compares two JSON pointers for equality
/// @sa https://json.nlohmann.me/api/json_pointer/operator_eq/
@ -14564,6 +14571,12 @@ class json_pointer
// NOLINTNEXTLINE(readability-redundant-declaration)
friend bool operator!=(const StringType& lhs,
const json_pointer<RefStringTypeRhs>& rhs);
/// @brief compares two JSON pointer for less-than
template<typename RefStringTypeLhs, typename RefStringTypeRhs>
// NOLINTNEXTLINE(readability-redundant-declaration)
friend bool operator<(const json_pointer<RefStringTypeLhs>& lhs,
const json_pointer<RefStringTypeRhs>& rhs) noexcept;
#endif
private:
@ -14571,7 +14584,7 @@ class json_pointer
std::vector<string_t> reference_tokens;
};
#ifndef JSON_HAS_CPP_20
#if !JSON_HAS_THREE_WAY_COMPARISON
// functions cannot be defined inside class due to ODR violations
template<typename RefStringTypeLhs, typename RefStringTypeRhs>
inline bool operator==(const json_pointer<RefStringTypeLhs>& lhs,
@ -14618,6 +14631,13 @@ inline bool operator!=(const StringType& lhs,
{
return !(lhs == rhs);
}
template<typename RefStringTypeLhs, typename RefStringTypeRhs>
inline bool operator<(const json_pointer<RefStringTypeLhs>& lhs,
const json_pointer<RefStringTypeRhs>& rhs) noexcept
{
return lhs.reference_tokens < rhs.reference_tokens;
}
#endif
NLOHMANN_JSON_NAMESPACE_END

27
tests/src/unit-json_pointer.cpp
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@ -15,6 +15,7 @@ using nlohmann::json;
using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
#endif
#include <map>
#include <sstream>
TEST_CASE("JSON pointers")
@ -697,6 +698,32 @@ TEST_CASE("JSON pointers")
}
}
SECTION("less-than comparison")
{
auto ptr1 = json::json_pointer("/foo/a");
auto ptr2 = json::json_pointer("/foo/b");
CHECK(ptr1 < ptr2);
CHECK_FALSE(ptr2 < ptr1);
// build with C++20
// JSON_HAS_CPP_20
#if JSON_HAS_THREE_WAY_COMPARISON
CHECK((ptr1 <=> ptr2) == std::strong_ordering::less); // *NOPAD*
CHECK(ptr2 > ptr1);
#endif
}
SECTION("usable as map key")
{
auto ptr = json::json_pointer("/foo");
std::map<json::json_pointer, int> m;
m[ptr] = 42;
CHECK(m.find(ptr) != m.end());
}
SECTION("backwards compatibility and mixing")
{
json j = R"(