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// Test for value-based skip functionality
// Related to GitHub issue #1994
#include <string>
#include "glaze/glaze.hpp"
#include "ut/ut.hpp"
using namespace ut;
struct MyJson
{
std::string name = "John";
int age = 12;
std::string city = "New York";
};
template <>
struct glz::meta<MyJson>
{
template <class T>
static constexpr bool skip_if(T&& value, std::string_view key, const glz::meta_context&)
{
using V = std::decay_t<T>;
if constexpr (std::same_as<V, std::string>) {
return key == "name" && value == "John";
}
else if constexpr (std::same_as<V, int>) {
return key == "age" && value == 12;
}
return false;
}
};
suite value_based_skip_tests = [] {
"skip_default_values"_test = [] {
MyJson obj{};
obj.name = "John"; // Default value
obj.age = 12; // Default value
obj.city = "Boston"; // Non-default value
std::string buffer{};
auto ec = glz::write_json(obj, buffer);
expect(!ec);
// Should only contain city since name and age have default values
expect(buffer == R"({"city":"Boston"})") << buffer;
};
"include_non_default_values"_test = [] {
MyJson obj{};
obj.name = "Jane"; // Non-default value
obj.age = 25; // Non-default value
obj.city = "Seattle";
std::string buffer{};
auto ec = glz::write_json(obj, buffer);
expect(!ec);
// Should contain all fields since none have default values
expect(buffer == R"({"name":"Jane","age":25,"city":"Seattle"})") << buffer;
};
"mixed_default_and_non_default"_test = [] {
MyJson obj{};
obj.name = "John"; // Default value - should be skipped
obj.age = 30; // Non-default value - should be included
obj.city = "LA";
std::string buffer{};
auto ec = glz::write_json(obj, buffer);
expect(!ec);
// Should not contain name (default), but should contain age and city
expect(buffer == R"({"age":30,"city":"LA"})") << buffer;
};
};
// Test combining skip and skip_if
struct CombinedSkip
{
std::string id{};
std::string secret{};
int count = 0;
};
template <>
struct glz::meta<CombinedSkip>
{
// Compile-time skip: always exclude secret
static constexpr bool skip(const std::string_view key, const glz::meta_context&) { return key == "secret"; }
// Runtime skip: exclude count when it's 0
template <class T>
static constexpr bool skip_if(T&& value, std::string_view key, const glz::meta_context&)
{
using V = std::decay_t<T>;
if constexpr (std::same_as<V, int>) {
return key == "count" && value == 0;
}
return false;
}
};
suite combined_skip_tests = [] {
"skip_and_skip_if_together"_test = [] {
CombinedSkip obj1{"123", "my_secret", 0};
std::string buffer1{};
auto ec = glz::write_json(obj1, buffer1);
expect(!ec);
// secret skipped by skip(), count skipped by skip_if()
expect(buffer1 == R"({"id":"123"})") << buffer1;
CombinedSkip obj2{"456", "another_secret", 5};
std::string buffer2{};
ec = glz::write_json(obj2, buffer2);
expect(!ec);
// secret skipped by skip(), count included (non-zero)
expect(buffer2 == R"({"id":"456","count":5})") << buffer2;
};
};
int main() { return 0; }
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