9b32f72584
As I learned in https://github.com/melpon/wandbox/issues/209, this library is already installed at Wandbox, so we need to adjust the examples to use `#include "json.hpp"` insteas of `#include <json.hpp>`.
37 lines
1,020 B
C++
37 lines
1,020 B
C++
#include "json.hpp"
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using json = nlohmann::json;
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int main()
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{
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// create JSON values
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json j_boolean = true;
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json j_number_integer = 17;
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json j_number_float = 23.42;
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json j_object = {{"one", 1}, {"two", 2}};
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json j_object_empty(json::value_t::object);
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json j_array = {1, 2, 4, 8, 16};
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json j_array_empty(json::value_t::array);
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json j_string = "Hello, world";
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// call back()
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std::cout << j_boolean.back() << '\n';
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std::cout << j_number_integer.back() << '\n';
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std::cout << j_number_float.back() << '\n';
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std::cout << j_object.back() << '\n';
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//std::cout << j_object_empty.back() << '\n'; // undefined behavior
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std::cout << j_array.back() << '\n';
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//std::cout << j_array_empty.back() << '\n'; // undefined behavior
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std::cout << j_string.back() << '\n';
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// back() called on a null value
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try
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{
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json j_null;
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j_null.back();
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}
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catch (json::invalid_iterator& e)
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{
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std::cout << e.what() << '\n';
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}
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}
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