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@@ -0,0 +1,71 @@
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+//
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+// json_binder_custom.t.h
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+// json
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+//
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+// Created by Sam Jaffe on 9/12/17.
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+//
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+
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+#pragma once
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+
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+#include <cxxtest/TestSuite.h>
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+#include "json_binder.hpp"
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+
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+#include <iomanip>
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+
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+using namespace json::binder;
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+using namespace json::parser;
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+
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+class precision_binder : public binder_impl<double> {
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+public:
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+ precision_binder(int d) : digits(d), trunc(std::pow(10, d)) {}
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+ virtual ~precision_binder() = default;
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+
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+ binder_impl<double> * clone() const override {
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+ return new precision_binder{*this};
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+ }
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+
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+ void parse(double & value, char const * & str, options) const override {
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+ std::sscanf(str, "%lf", &value);
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+ value = static_cast<long long>(value * trunc) / trunc;
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+ json::parse_discard_token(str); // Advance to the boundary
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+ }
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+
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+ void write(double const & value, std::ostream & out) const override {
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+ out << std::fixed << std::setprecision(digits) << value;
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+ }
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+private:
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+ int digits;
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+ double trunc;
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+};
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+
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+class json_binder_custom_TestSuite : public CxxTest::TestSuite {
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+public:
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+ struct TestObject {
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+ double A; // four_digits
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+ double B; // two_digits
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+ double C;
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+ bool operator==(TestObject const & other) const {
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+ return A == other.A && B == other.B && C == other.C;
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+ }
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+ };
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+
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+ static object_binder<TestObject> GetImpl() {
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+ return object_binder<TestObject>()
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+ ("A", &TestObject::A, precision_binder(4))
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+ ("B", &TestObject::B, precision_binder(2))
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+ ("C", &TestObject::C);
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+ }
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+
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+ static object_binder<TestObject> & Get() {
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+ static object_binder<TestObject> val = GetImpl();
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+ return val;
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+ }
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+
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+ void test_() {
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+ char data[] = "{\"A\":1.00008, \"B\":1.0, \"C\":1.523211102}";
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+ TestObject out{0.0, 0.0, 0.0};
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+ TestObject const expected{1.0, 1.0, 1.523211102};
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+ TS_ASSERT_THROWS_NOTHING(parse(json::binder::bind(out, Get()), data));
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+ TS_ASSERT_EQUALS(out, expected);
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+ }
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+};
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Sam Jaffe