deploy: 94fe31eb9b

examples/no_exceptions_parse.cpp

@@ -0,0 +1,28 @@
+#include <cstdint>
+#include <iostream>
+#include <vector>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+// None of the calls below throws, so this example also works with -fno-exceptions.
+int main()
+{
+    const std::string invalid = R"({"name": "Mary", "age": )";
+
+    // parse() with allow_exceptions = false returns a discarded value
+    json j = json::parse(invalid, nullptr, false);
+    std::cout << std::boolalpha << "parse: discarded = " << j.is_discarded() << '\n';
+
+    // accept() only tells whether the input is valid JSON
+    std::cout << "accept: " << json::accept(invalid) << '\n';
+
+    // the binary formats have the same parameter
+    const std::vector<std::uint8_t> truncated_cbor = {0x83, 0x01};
+    json c = json::from_cbor(truncated_cbor, true, false);
+    std::cout << "from_cbor: discarded = " << c.is_discarded() << '\n';
+
+    // valid input is parsed as usual
+    json valid = json::parse(R"({"name": "Mary"})", nullptr, false);
+    std::cout << "valid input: " << valid << '\n';
+}