Go 语言规范Operators
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Operators combine operands into expressions.
Expression = UnaryExpr | Expression binary_op Expression .
UnaryExpr = PrimaryExpr | unary_op UnaryExpr .binary_op = "||" | "&&" | rel_op | add_op | mul_op .
rel_op = "==" | "!=" | "<" | "<=" | ">" | ">=" .
add_op = "+" | "-" | "|" | "^" .
mul_op = "*" | "/" | "%" | "<<" | ">>" | "&" | "&^" .unary_op = "+" | "-" | "!" | "^" | "*" | "&" | "<-" .
Comparisons are discussed elsewhere. For other binary operators, the operand types must be identical unless the operation involves shifts or untyped constants. For operations involving constants only, see the section on constant expressions.
Except for shift operations, if one operand is an untyped constant and the other operand is not, the constant is implicitly converted to the type of the other operand.
The right operand in a shift expression must have integer type or be an untyped constant representable by a value of type uint. If the left operand of a non-constant shift expression is an untyped constant, it is first implicitly converted to the type it would assume if the shift expression were replaced by its left operand alone.
var s uint = 33
var i = 1<<s // 1 has type int
var j int32 = 1<<s // 1 has type int32; j == 0
var k = uint64(1<<s) // 1 has type uint64; k == 1<<33
var m int = 1.0<<s // 1.0 has type int; m == 0 if ints are 32bits in size
var n = 1.0<<s == j // 1.0 has type int32; n == true
var o = 1<<s == 2<<s // 1 and 2 have type int; o == true if ints are 32bits in size
var p = 1<<s == 1<<33 // illegal if ints are 32bits in size: 1 has type int, but 1<<33 overflows int
var u = 1.0<<s // illegal: 1.0 has type float64, cannot shift
var u1 = 1.0<<s != 0 // illegal: 1.0 has type float64, cannot shift
var u2 = 1<<s != 1.0 // illegal: 1 has type float64, cannot shift
var v float32 = 1<<s // illegal: 1 has type float32, cannot shift
var w int64 = 1.0<<33 // 1.0<<33 is a constant shift expression
var x = a[1.0<<s] // 1.0 has type int; x == a[0] if ints are 32bits in size
var a = make([]byte, 1.0<<s) // 1.0 has type int; len(a) == 0 if ints are 32bits in size本文中的所有译文仅用于学习和交流目的，转载请务必注明文章译者、出处、和本文链接
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