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      1 // run
      2 
      3 // Copyright 2009 The Go Authors. All rights reserved.
      4 // Use of this source code is governed by a BSD-style
      5 // license that can be found in the LICENSE file.
      6 
      7 // Test that basic operations on named types are valid
      8 // and preserve the type.
      9 
     10 package main
     11 
     12 type Array [10]byte
     13 type Bool bool
     14 type Chan chan int
     15 type Float float32
     16 type Int int
     17 type Map map[int]byte
     18 type Slice []byte
     19 type String string
     20 
     21 // Calling these functions checks at compile time that the argument
     22 // can be converted implicitly to (used as) the given type.
     23 func asArray(Array)   {}
     24 func asBool(Bool)     {}
     25 func asChan(Chan)     {}
     26 func asFloat(Float)   {}
     27 func asInt(Int)       {}
     28 func asMap(Map)       {}
     29 func asSlice(Slice)   {}
     30 func asString(String) {}
     31 
     32 func (Map) M() {}
     33 
     34 
     35 // These functions check at run time that the default type
     36 // (in the absence of any implicit conversion hints)
     37 // is the given type.
     38 func isArray(x interface{})  { _ = x.(Array) }
     39 func isBool(x interface{})   { _ = x.(Bool) }
     40 func isChan(x interface{})   { _ = x.(Chan) }
     41 func isFloat(x interface{})  { _ = x.(Float) }
     42 func isInt(x interface{})    { _ = x.(Int) }
     43 func isMap(x interface{})    { _ = x.(Map) }
     44 func isSlice(x interface{})  { _ = x.(Slice) }
     45 func isString(x interface{}) { _ = x.(String) }
     46 
     47 func main() {
     48 	var (
     49 		a     Array
     50 		b     Bool   = true
     51 		c     Chan   = make(Chan)
     52 		f     Float  = 1
     53 		i     Int    = 1
     54 		m     Map    = make(Map)
     55 		slice Slice  = make(Slice, 10)
     56 		str   String = "hello"
     57 	)
     58 
     59 	asArray(a)
     60 	isArray(a)
     61 	asArray(*&a)
     62 	isArray(*&a)
     63 	asArray(Array{})
     64 	isArray(Array{})
     65 
     66 	asBool(b)
     67 	isBool(b)
     68 	asBool(!b)
     69 	isBool(!b)
     70 	asBool(true)
     71 	asBool(*&b)
     72 	isBool(*&b)
     73 	asBool(Bool(true))
     74 	isBool(Bool(true))
     75 
     76 	asChan(c)
     77 	isChan(c)
     78 	asChan(make(Chan))
     79 	isChan(make(Chan))
     80 	asChan(*&c)
     81 	isChan(*&c)
     82 	asChan(Chan(nil))
     83 	isChan(Chan(nil))
     84 
     85 	asFloat(f)
     86 	isFloat(f)
     87 	asFloat(-f)
     88 	isFloat(-f)
     89 	asFloat(+f)
     90 	isFloat(+f)
     91 	asFloat(f + 1)
     92 	isFloat(f + 1)
     93 	asFloat(1 + f)
     94 	isFloat(1 + f)
     95 	asFloat(f + f)
     96 	isFloat(f + f)
     97 	f++
     98 	f += 2
     99 	asFloat(f - 1)
    100 	isFloat(f - 1)
    101 	asFloat(1 - f)
    102 	isFloat(1 - f)
    103 	asFloat(f - f)
    104 	isFloat(f - f)
    105 	f--
    106 	f -= 2
    107 	asFloat(f * 2.5)
    108 	isFloat(f * 2.5)
    109 	asFloat(2.5 * f)
    110 	isFloat(2.5 * f)
    111 	asFloat(f * f)
    112 	isFloat(f * f)
    113 	f *= 4
    114 	asFloat(f / 2.5)
    115 	isFloat(f / 2.5)
    116 	asFloat(2.5 / f)
    117 	isFloat(2.5 / f)
    118 	asFloat(f / f)
    119 	isFloat(f / f)
    120 	f /= 4
    121 	asFloat(f)
    122 	isFloat(f)
    123 	f = 5
    124 	asFloat(*&f)
    125 	isFloat(*&f)
    126 	asFloat(234)
    127 	asFloat(Float(234))
    128 	isFloat(Float(234))
    129 	asFloat(1.2)
    130 	asFloat(Float(i))
    131 	isFloat(Float(i))
    132 
    133 	asInt(i)
    134 	isInt(i)
    135 	asInt(-i)
    136 	isInt(-i)
    137 	asInt(^i)
    138 	isInt(^i)
    139 	asInt(+i)
    140 	isInt(+i)
    141 	asInt(i + 1)
    142 	isInt(i + 1)
    143 	asInt(1 + i)
    144 	isInt(1 + i)
    145 	asInt(i + i)
    146 	isInt(i + i)
    147 	i++
    148 	i += 1
    149 	asInt(i - 1)
    150 	isInt(i - 1)
    151 	asInt(1 - i)
    152 	isInt(1 - i)
    153 	asInt(i - i)
    154 	isInt(i - i)
    155 	i--
    156 	i -= 1
    157 	asInt(i * 2)
    158 	isInt(i * 2)
    159 	asInt(2 * i)
    160 	isInt(2 * i)
    161 	asInt(i * i)
    162 	isInt(i * i)
    163 	i *= 2
    164 	asInt(i / 5)
    165 	isInt(i / 5)
    166 	asInt(5 / i)
    167 	isInt(5 / i)
    168 	asInt(i / i)
    169 	isInt(i / i)
    170 	i /= 2
    171 	asInt(i % 5)
    172 	isInt(i % 5)
    173 	asInt(5 % i)
    174 	isInt(5 % i)
    175 	asInt(i % i)
    176 	isInt(i % i)
    177 	i %= 2
    178 	asInt(i & 5)
    179 	isInt(i & 5)
    180 	asInt(5 & i)
    181 	isInt(5 & i)
    182 	asInt(i & i)
    183 	isInt(i & i)
    184 	i &= 2
    185 	asInt(i &^ 5)
    186 	isInt(i &^ 5)
    187 	asInt(5 &^ i)
    188 	isInt(5 &^ i)
    189 	asInt(i &^ i)
    190 	isInt(i &^ i)
    191 	i &^= 2
    192 	asInt(i | 5)
    193 	isInt(i | 5)
    194 	asInt(5 | i)
    195 	isInt(5 | i)
    196 	asInt(i | i)
    197 	isInt(i | i)
    198 	i |= 2
    199 	asInt(i ^ 5)
    200 	isInt(i ^ 5)
    201 	asInt(5 ^ i)
    202 	isInt(5 ^ i)
    203 	asInt(i ^ i)
    204 	isInt(i ^ i)
    205 	i ^= 2
    206 	asInt(i << 4)
    207 	isInt(i << 4)
    208 	i <<= 2
    209 	asInt(i >> 4)
    210 	isInt(i >> 4)
    211 	i >>= 2
    212 	asInt(i)
    213 	isInt(i)
    214 	asInt(0)
    215 	asInt(Int(0))
    216 	isInt(Int(0))
    217 	i = 10
    218 	asInt(*&i)
    219 	isInt(*&i)
    220 	asInt(23)
    221 	asInt(Int(f))
    222 	isInt(Int(f))
    223 
    224 	asMap(m)
    225 	isMap(m)
    226 	asMap(nil)
    227 	m = nil
    228 	asMap(make(Map))
    229 	isMap(make(Map))
    230 	asMap(*&m)
    231 	isMap(*&m)
    232 	asMap(Map(nil))
    233 	isMap(Map(nil))
    234 	asMap(Map{})
    235 	isMap(Map{})
    236 
    237 	asSlice(slice)
    238 	isSlice(slice)
    239 	asSlice(make(Slice, 5))
    240 	isSlice(make(Slice, 5))
    241 	asSlice([]byte{1, 2, 3})
    242 	asSlice([]byte{1, 2, 3}[0:2])
    243 	asSlice(slice[0:4])
    244 	isSlice(slice[0:4])
    245 	asSlice(slice[3:8])
    246 	isSlice(slice[3:8])
    247 	asSlice(nil)
    248 	asSlice(Slice(nil))
    249 	isSlice(Slice(nil))
    250 	slice = nil
    251 	asSlice(Slice{1, 2, 3})
    252 	isSlice(Slice{1, 2, 3})
    253 	asSlice(Slice{})
    254 	isSlice(Slice{})
    255 	asSlice(*&slice)
    256 	isSlice(*&slice)
    257 
    258 	asString(str)
    259 	isString(str)
    260 	asString(str + "a")
    261 	isString(str + "a")
    262 	asString("a" + str)
    263 	isString("a" + str)
    264 	asString(str + str)
    265 	isString(str + str)
    266 	str += "a"
    267 	str += str
    268 	asString(String('a'))
    269 	isString(String('a'))
    270 	asString(String([]byte(slice)))
    271 	isString(String([]byte(slice)))
    272 	asString(String([]byte(nil)))
    273 	isString(String([]byte(nil)))
    274 	asString("hello")
    275 	asString(String("hello"))
    276 	isString(String("hello"))
    277 	str = "hello"
    278 	isString(str)
    279 	asString(*&str)
    280 	isString(*&str)
    281 }
    282