remove integer and float casting syntax

 * add `@intCast`
 * add `@floatCast`
 * add `@floatToInt`
 * add `@intToFloat`

See #1061

1 files changed, 6 insertions, 5 deletions

diff --git a/std/math/log.zig b/std/math/log.zig
index 2c876081d8..20b6d055e8 100644
--- a/std/math/log.zig
+++ b/std/math/log.zig
@@ -13,22 +13,23 @@ pub fn log(comptime T: type, base: T, x: T) T {
         return math.ln(x);
     }
 
+    const float_base = math.lossyCast(f64, base);
     switch (@typeId(T)) {
         TypeId.ComptimeFloat => {
-            return @typeOf(1.0)(math.ln(f64(x)) / math.ln(f64(base)));
+            return @typeOf(1.0)(math.ln(f64(x)) / math.ln(float_base));
         },
         TypeId.ComptimeInt => {
-            return @typeOf(1)(math.floor(math.ln(f64(x)) / math.ln(f64(base))));
+            return @typeOf(1)(math.floor(math.ln(f64(x)) / math.ln(float_base)));
         },
         builtin.TypeId.Int => {
             // TODO implement integer log without using float math
-            return T(math.floor(math.ln(f64(x)) / math.ln(f64(base))));
+            return @floatToInt(T, math.floor(math.ln(@intToFloat(f64, x)) / math.ln(float_base)));
         },
 
         builtin.TypeId.Float => {
             switch (T) {
-                f32 => return f32(math.ln(f64(x)) / math.ln(f64(base))),
-                f64 => return math.ln(x) / math.ln(f64(base)),
+                f32 => return @floatCast(f32, math.ln(f64(x)) / math.ln(float_base)),
+                f64 => return math.ln(x) / math.ln(float_base),
                 else => @compileError("log not implemented for " ++ @typeName(T)),
             }
         },