24 lines
572 B
V
24 lines
572 B
V
import context
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type ValueContextKey = string
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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 ValueContextKey) string {
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if value := ctx.value(key) {
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if !isnil(value) {
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return *(&string(value))
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}
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}
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return 'key not found'
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}
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key := ValueContextKey('language')
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value := 'VAL'
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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 'key not found' == f(ctx, ValueContextKey('color'))
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}
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