Deterministic Replacements

[TonyValenti]

If I have a deterministic function/expression that is called with constant parameters, it would be nice if C# would evaluate the expression at compile time and replace the expression with the value.

[Joe4evr]

#2379

[Unknown6656]

I'll just mention the other related issues/proposals here:

• dotnet/csharplang#1763: "[C#-X.0 Proposal] Determinism"
• dotnet/csharplang#504: "Enable Compile-Time Folding of Deterministic Outputs"
• dotnet/csharplang#776: "C# Pure Function Keyword to Mark No Side Effects Or External Dependencies"
• dotnet/csharplang#1028: "Compile time expressions"
• dotnet/csharplang#1413: "Compile-Time method inlining"
• dotnet/roslyn#9627: "Compile Time Function Execution"
• dotnet/roslyn#10506: "Static Expressions"
• dotnet/roslyn#11259: "Constant string interpolation"
• dotnet/roslyn#12238: "Compile time expressions"
• dotnet/roslyn#14665: "Constant expression - Power operator?"
• dotnet/roslyn#15079: "How would you imagine constexpr in C#?"
• dotnet/coreclr#3633: "Optimizing constant_string.Length"