digitalmars.D.learn - Converting member variables to strings with using reflection from base
- kerdemdemir (36/36) Dec 22 2017 I want to make a logging function for member variables by using
- H. S. Teoh (10/19) Dec 22 2017 Try this:
- Mengu (25/45) Dec 22 2017 and then turn it into a LoggerMixin with a mixin template and
I want to make a logging function for member variables by using reflection. import std.stdio; class D : B { override void foo() { a = 4.0; b = 3.0; } double a; double b; } class B { void Log() { auto a = [__traits(derivedMembers, D)]; foreach(memberName; a) { // Somehow write only member variables with their names // Result should be : a = 4.0, b = 3.0 } } void foo() { } } void main() { auto b = new D; b.Log(); } As I wrote in the comments I want to see member variable's name and its value. What is the best way to achieve that? Erdem
Dec 22 2017
On Fri, Dec 22, 2017 at 09:13:31PM +0000, kerdemdemir via Digitalmars-d-learn wrote:I want to make a logging function for member variables by using reflection.[...]class B { void Log() { auto a = [__traits(derivedMembers, D)]; foreach(memberName; a) { // Somehow write only member variables with their names // Result should be : a = 4.0, b = 3.0Try this: import std.traits : FieldNameTuple; foreach (memberName; FieldNameTuple!B) { writefln("%s = %s", memberName, mixin("this." ~ memberName)); } T -- People walk. Computers run.
Dec 22 2017
On Friday, 22 December 2017 at 22:09:05 UTC, H. S. Teoh wrote:On Fri, Dec 22, 2017 at 09:13:31PM +0000, kerdemdemir via Digitalmars-d-learn wrote:and then turn it into a LoggerMixin with a mixin template and re-use it any time you want. import std.stdio : writeln, writefln; import std.traits : FieldNameTuple; mixin template LoggerMixin() { void Log() { foreach (memberName; FieldNameTuple!(typeof(this))) { writefln("%s = %s", memberName, mixin("this." ~ memberName)); } } } struct S { int x; bool y; double z; mixin LoggerMixin; } void main() { S s1 = S(int.min, true, 6666); S s2 = S(int.max, false, 6666); s1.Log(); s2.Log(); }I want to make a logging function for member variables by using reflection.[...]class B { void Log() { auto a = [__traits(derivedMembers, D)]; foreach(memberName; a) { // Somehow write only member variables with their names // Result should be : a = 4.0, b = 3.0Try this: import std.traits : FieldNameTuple; foreach (memberName; FieldNameTuple!B) { writefln("%s = %s", memberName, mixin("this." ~ memberName)); } T
Dec 22 2017