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lemirelemire
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This adds another example (simdjson#785)
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‎doc/basics.md‎

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@@ -124,6 +124,27 @@ for (dom::object car : parser.parse(cars_json)) {
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}
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```
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Here is a different example illustrating the same ideas:
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```C++
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auto abstract_json = R"( [
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{ "12345" : {"a":12.34, "b":56.78, "c": 9998877} },
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{ "12545" : {"a":11.44, "b":12.78, "c": 11111111} }
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] )"_padded;
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dom::parser parser;
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// Parse and iterate through an array of objects
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for (dom::object obj : parser.parse(abstract_json)) {
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for(const auto& key_value : obj) {
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cout << "key: " << key_value.key << " : ";
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dom::object innerobj = key_value.value;
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cout << "a: " << double(innerobj["a"]) << ", ";
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cout << "b: " << double(innerobj["b"]) << ", ";
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cout << "c: " << int64_t(innerobj["c"]) << endl;
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}
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}
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```
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C++17 Support
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-------------
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@@ -277,6 +298,49 @@ for (auto field : car) {
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}
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```
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Here is another example:
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```C++
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auto abstract_json = R"( [
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{ "12345" : {"a":12.34, "b":56.78, "c": 9998877} },
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{ "12545" : {"a":11.44, "b":12.78, "c": 11111111} }
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] )"_padded;
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dom::parser parser;
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dom::array rootarray;
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simdjson::error_code error;
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parser.parse(abstract_json).get<dom::array>().tie(rootarray, error);
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if (error) { cerr << error << endl; exit(1); }
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// Iterate through an array of objects
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for (dom::element elem : rootarray) {
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dom::object obj;
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elem.get<dom::object>().tie(obj, error);
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if (error) { cerr << error << endl; exit(1); }
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for(auto & key_value : obj) {
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cout << "key: " << key_value.key << " : ";
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dom::object innerobj;
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key_value.value.get<dom::object>().tie(innerobj, error);
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if (error) { cerr << error << endl; exit(1); }
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double va;
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innerobj["a"].get<double>().tie(va, error);
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if (error) { cerr << error << endl; exit(1); }
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cout << "a: " << va << ", ";
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double vb;
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innerobj["b"].get<double>().tie(vb, error);
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if (error) { cerr << error << endl; exit(1); }
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cout << "b: " << vb << ", ";
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int64_t vc;
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innerobj["c"].get<int64_t>().tie(vc, error);
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if (error) { cerr << error << endl; exit(1); }
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cout << "c: " << vc << endl;
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}
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}
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```
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### Exceptions
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Users more comfortable with an exception flow may choose to directly cast the `simdjson_result<T>` to the desired type:

‎tests/readme_examples.cpp‎

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@@ -52,6 +52,8 @@ void basics_dom_1() {
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}
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}
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void basics_dom_2() {
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auto cars_json = R"( [
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{ "make": "Toyota", "model": "Camry", "year": 2018, "tire_pressure": [ 40.1, 39.9, 37.7, 40.4 ] },
@@ -63,6 +65,27 @@ void basics_dom_2() {
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cout << cars.at("0/tire_pressure/1") << endl; // Prints 39.9
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}
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void basics_dom_3() {
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auto abstract_json = R"( [
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{ "12345" : {"a":12.34, "b":56.78, "c": 9998877} },
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{ "12545" : {"a":11.44, "b":12.78, "c": 11111111} }
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] )"_padded;
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dom::parser parser;
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// Parse and iterate through an array of objects
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for (dom::object obj : parser.parse(abstract_json)) {
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for(const auto& key_value : obj) {
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cout << "key: " << key_value.key << " : ";
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dom::object innerobj = key_value.value;
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cout << "a: " << double(innerobj["a"]) << ", ";
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cout << "b: " << double(innerobj["b"]) << ", ";
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cout << "c: " << int64_t(innerobj["c"]) << endl;
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}
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}
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}
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namespace treewalk_1 {
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void print_json(dom::element element) {
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switch (element.type()) {
@@ -210,5 +233,8 @@ SIMDJSON_POP_DISABLE_WARNINGS
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#endif
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int main() {
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basics_dom_1();
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basics_dom_2();
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basics_dom_3();
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return 0;
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}

‎tests/readme_examples_noexceptions.cpp‎

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@@ -77,6 +77,46 @@ void basics_error_3() {
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}
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}
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}
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void basics_error_4() {
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auto abstract_json = R"( [
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{ "12345" : {"a":12.34, "b":56.78, "c": 9998877} },
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{ "12545" : {"a":11.44, "b":12.78, "c": 11111111} }
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] )"_padded;
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dom::parser parser;
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dom::array rootarray;
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simdjson::error_code error;
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parser.parse(abstract_json).get<dom::array>().tie(rootarray, error);
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if (error) { cerr << error << endl; exit(1); }
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// Iterate through an array of objects
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for (dom::element elem : rootarray) {
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dom::object obj;
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elem.get<dom::object>().tie(obj, error);
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if (error) { cerr << error << endl; exit(1); }
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for(auto & key_value : obj) {
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cout << "key: " << key_value.key << " : ";
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dom::object innerobj;
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key_value.value.get<dom::object>().tie(innerobj, error);
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if (error) { cerr << error << endl; exit(1); }
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double va;
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innerobj["a"].get<double>().tie(va, error);
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if (error) { cerr << error << endl; exit(1); }
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cout << "a: " << va << ", ";
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double vb;
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innerobj["b"].get<double>().tie(vb, error);
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if (error) { cerr << error << endl; exit(1); }
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cout << "b: " << vb << ", ";
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int64_t vc;
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innerobj["c"].get<int64_t>().tie(vc, error);
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if (error) { cerr << error << endl; exit(1); }
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cout << "c: " << vc << endl;
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}
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}
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}
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#ifdef SIMDJSON_CPLUSPLUS17
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void basics_error_3_cpp17() {
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#endif
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int main() {
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basics_error_2();
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basics_error_3();
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basics_error_4();
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return 0;
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}

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