Programming on purpose essays on software design

D is designed such that most "obvious" code is fast and safe. On occasion a function might need to escape the confines of type safety for ultimate speed and control. For such rare cases D offers native pointers, type casts, access to any C function without any intervening translation, manual memory management, custom allocators and even inline assembly code. import ; void livingDangerously() { // Access to C's malloc and free primitives auto buf = malloc(1024 * 1024); // free automatically upon scope exit scope (exit) free(buf); // Interprets memory as an array of floats auto floats = cast ( float []) buf[0 .. 1024 * 1024]; // Even stack allocation is possible auto moreBuf = alloca(4096 * 100); //... } // Using inline asm for extra speed on x86 uint checked_multiply( uint x, uint y) { uint result; version (D_InlineAsm_X86) { // Inline assembler "sees" D variables. asm { mov EAX,x ; mul EAX,y ; mov result,EAX ; jc Loverflow ; } return result; } else { result = x * y; if (!y || x <= uint .max / y) return result; } Loverflow: throw new Exception( "multiply overflow" ); } void main() { // ... }

Programming on purpose essays on software design

programming on purpose essays on software design

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programming on purpose essays on software designprogramming on purpose essays on software designprogramming on purpose essays on software designprogramming on purpose essays on software design