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author | Indrajith K L | 2022-12-03 17:00:20 +0530 |
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committer | Indrajith K L | 2022-12-03 17:00:20 +0530 |
commit | f5c4671bfbad96bf346bd7e9a21fc4317b4959df (patch) | |
tree | 2764fc62da58f2ba8da7ed341643fc359873142f /v_windows/v/vlib/context/value.v | |
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Diffstat (limited to 'v_windows/v/vlib/context/value.v')
-rw-r--r-- | v_windows/v/vlib/context/value.v | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/v_windows/v/vlib/context/value.v b/v_windows/v/vlib/context/value.v new file mode 100644 index 0000000..19a2289 --- /dev/null +++ b/v_windows/v/vlib/context/value.v @@ -0,0 +1,57 @@ +// This module defines the Context type, which carries deadlines, cancellation signals, +// and other request-scoped values across API boundaries and between processes. +// Based off: https://github.com/golang/go/tree/master/src/context +// Last commit: https://github.com/golang/go/commit/52bf14e0e8bdcd73f1ddfb0c4a1d0200097d3ba2 +module context + +import time + +// A ValueContext carries a key-value pair. It implements Value for that key and +// delegates all other calls to the embedded Context. +pub struct ValueContext { + key string + value voidptr +mut: + context Context +} + +// with_value returns a copy of parent in which the value associated with key is +// val. +// +// Use context Values only for request-scoped data that transits processes and +// APIs, not for passing optional parameters to functions. +// +// The provided key must be comparable and should not be of type +// string or any other built-in type to avoid collisions between +// packages using context. Users of with_value should define their own +// types for keys +pub fn with_value(parent Context, key string, value voidptr) Context { + return &ValueContext{ + context: parent + key: key + value: value + } +} + +pub fn (ctx ValueContext) deadline() ?time.Time { + return ctx.context.deadline() +} + +pub fn (ctx ValueContext) done() chan int { + return ctx.context.done() +} + +pub fn (ctx ValueContext) err() IError { + return ctx.context.err() +} + +pub fn (ctx ValueContext) value(key string) ?voidptr { + if ctx.key == key { + return ctx.value + } + return ctx.context.value(key) +} + +pub fn (ctx ValueContext) str() string { + return context_name(ctx.context) + '.with_value' +} |