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langref: explicitly mention inline combined with multiple cases

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closes #18524
This commit is contained in:
Andrew Kelley
2024-01-21 16:11:20 -07:00
parent fdb4eb3056
commit 559bbf1cc6
1 changed files with 16 additions and 5 deletions
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21
doc/langref.html.in
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@@ -4311,10 +4311,11 @@ test "enum literals with switch" {
{#code_end#}
{#header_close#}
{#header_open|Inline switch#}
{#header_open|Inline Switch Prongs#}
<p>
Switch prongs can be marked as {#syntax#}inline{#endsyntax#} to generate
the prong's body for each possible value it could have:
the prong's body for each possible value it could have, making the
captured value {#link|comptime#}.
</p>
{#code_begin|test|test_inline_switch#}
const std = @import("std");
@@ -4324,9 +4325,9 @@ const expectError = std.testing.expectError;
fn isFieldOptional(comptime T: type, field_index: usize) !bool {
const fields = @typeInfo(T).Struct.fields;
return switch (field_index) {
// This prong is analyzed `fields.len - 1` times with `idx` being a
// unique comptime-known value each time.
inline 0...fields.len - 1 => |idx| @typeInfo(fields[idx].type) == .Optional,
// This prong is analyzed twice with `idx` being a
// comptime-known value each time.
inline 0, 1 => |idx| @typeInfo(fields[idx].type) == .Optional,
else => return error.IndexOutOfBounds,
};
}
@@ -4350,6 +4351,16 @@ fn isFieldOptionalUnrolled(field_index: usize) !bool {
1 => true,
else => return error.IndexOutOfBounds,
};
}
{#code_end#}
<p>The {#syntax#}inline{#endsyntax#} keyword may also be combined with ranges:</p>
{#code_begin|syntax|inline_prong_range#}
fn isFieldOptional(comptime T: type, field_index: usize) !bool {
const fields = @typeInfo(T).Struct.fields;
return switch (field_index) {
inline 0...fields.len - 1 => |idx| @typeInfo(fields[idx].type) == .Optional,
else => return error.IndexOutOfBounds,
};
}
{#code_end#}
<p>