int_test.go

package henge

import (
	"fmt"
	"math"
	"strconv"
)

func ExampleValueConverter_Int() {
	fmt.Println("int64 to int64")
	fmt.Printf("%v -> %v\n", math.MaxInt64, New(math.MaxInt64).Int().Value())
	fmt.Printf("%v -> %v\n", math.MinInt64, New(math.MinInt64).Int().Value())
	fmt.Println()

	fmt.Println("uint64 to int64")
	fmt.Printf("%v -> %v\n", uint64(123), New(uint64(123)).Int().Value())
	fmt.Printf("%#v\n", New(uint64(math.MaxUint64)).Int().Error().Error())
	fmt.Println()

	fmt.Println("float64 to int64")
	fmt.Printf("%v -> %v\n", 1.25, New(1.25).Int().Value())
	fmt.Printf("%v -> %v\n", -1.25, New(-1.25).Int().Value())
	fmt.Printf("%v -> %v\n", math.MaxInt32, New(float64(math.MaxInt32)).Int().Value())
	// This behavior varies depending on the architecture.
	if val, err := New(float64(math.MaxInt64)).Int().Result(); err == nil {
		if val != math.MaxInt64 {
			fmt.Printf("%v -> %v\n", math.MaxInt64, val)
		}
	}
	fmt.Printf("%#v\n", New(math.MaxFloat64).Int().Error().Error())
	fmt.Println()

	fmt.Println("bool to int64")
	fmt.Printf("%v -> %v\n", true, New(true).Int().Value())
	fmt.Printf("%v -> %v\n", false, New(false).Int().Value())
	fmt.Println()

	fmt.Println("string to int64")
	fmt.Printf("\"%v\" -> %v\n", math.MaxInt64, New(strconv.FormatInt(math.MaxInt64, 10)).Int().Value())
	fmt.Printf("%#v\n", New("1.5").Int().Error().Error())
	fmt.Printf("%#v\n", New("-1.5").Int().Error().Error())

	// Output:
	// int64 to int64
	// 9223372036854775807 -> 9223372036854775807
	// -9223372036854775808 -> -9223372036854775808
	//
	// uint64 to int64
	// 123 -> 123
	// "Failed to convert from uint64 to int64: fields=, value=0xffffffffffffffff, error=overflows"
	//
	// float64 to int64
	// 1.25 -> 1
	// -1.25 -> -2
	// 2147483647 -> 2147483647
	// "Failed to convert from float64 to int64: fields=, value=1.7976931348623157e+308, error=overflows"
	//
	// bool to int64
	// true -> 1
	// false -> 0
	//
	// string to int64
	// "9223372036854775807" -> 9223372036854775807
	// "Failed to convert from string to int64: fields=, value=\"1.5\", error=strconv.ParseInt: parsing \"1.5\": invalid syntax"
	// "Failed to convert from string to int64: fields=, value=\"-1.5\", error=strconv.ParseInt: parsing \"-1.5\": invalid syntax"
}