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view tests/minicomplex/vararg2.d @ 1275:bedf0bfb8fdb
Implement first D-specific optimization pass: -simplify-drtcalls.
It uses the machinery of the standard -simplify-libcalls pass, but optimizes
calls to the D runtime instead of calls to C libraries.
At the moment, these optimizations are implemented by this pass:
- Avoid the runtime call for `arr.length = newlen` if it can determine that
the new length isn't longer than the old one.
- Ditto for `cast(T[]) arr` if it will clearly always succeed.
(e.g. if the length of the original array is zero, or if the old element
size is a multiple of the new element size)
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Tue, 28 Apr 2009 21:58:06 +0200 |
parents | 1bb99290e03a |
children |
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line source
module tangotests.vararg2; extern(C) int printf(char*, ...); import tango.core.Vararg; void main() { func(0xf00, 1, " ", 2, " ", 3, "\n", 0.3, "\n"); } void func(int foo, ...) { foreach(t; _arguments) { if (t == typeid(char[])) { char[] str = va_arg!(char[])(_argptr); printf("%.*s", str.length, str.ptr); } else if (t == typeid(int)) { printf("%d", va_arg!(int)(_argptr)); } else if (t == typeid(float)) { printf("%f", va_arg!(float)(_argptr)); } else if (t == typeid(double)) { printf("%f", va_arg!(double)(_argptr)); } else if (t == typeid(real)) { printf("%f", va_arg!(real)(_argptr)); } else { assert(0, "not int"); } } }