35 lines
621 B
V
35 lines
621 B
V
import context
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const not_found_value = &Value{
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val: 'key not found'
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}
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struct Value {
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val string
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}
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// This example demonstrates how a value can be passed to the context
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// and also how to retrieve it if it exists.
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fn test_with_value() {
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f := fn (ctx context.Context, key context.Key) &Value {
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if value := ctx.value(key) {
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match value {
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Value {
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return value
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}
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else {}
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}
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}
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return not_found_value
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}
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key := 'language'
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value := &Value{
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val: 'VAL'
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}
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ctx := context.with_value(context.background(), key, value)
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assert value == f(ctx, key)
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assert not_found_value == f(ctx, 'color')
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}
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