tmp/tmpu7jac5wn/{from.md → to.md}
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| 1 |
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#### Creation <a id="support.srcloc.cons">[[support.srcloc.cons]]</a>
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``` cpp
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static consteval source_location current() noexcept;
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```
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*Returns:*
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- When invoked by a function call whose *postfix-expression* is a
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(possibly parenthesized) *id-expression* naming `current`, returns a
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`source_location` with an implementation-defined value. The value
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should be affected by `#line` [[cpp.line]] in the same manner as for
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\_\_LINE\_\_ and \_\_FILE\_\_. The values of the exposition-only data
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members of the returned `source_location` object are indicated in
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[[support.srcloc.current]].
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- Otherwise, when invoked in some other way, returns a `source_location`
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whose data members are initialized with valid but unspecified values.
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*Remarks:* Any call to `current` that appears as a default member
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initializer [[class.mem]], or as a subexpression thereof, should
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correspond to the location of the constructor definition or aggregate
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initialization that uses the default member initializer. Any call to
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`current` that appears as a default argument [[dcl.fct.default]], or as
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a subexpression thereof, should correspond to the location of the
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invocation of the function that uses the default argument [[expr.call]].
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[*Example 1*:
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``` cpp
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struct s {
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source_location member = source_location::current();
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int other_member;
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s(source_location loc = source_location::current())
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: member(loc) // values of member refer to the location of the calling function[dcl.fct.default]
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{}
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s(int blather) : // values of member refer to this location
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other_member(blather)
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{}
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s(double) // values of member refer to this location
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{}
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};
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void f(source_location a = source_location::current()) {
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source_location b = source_location::current(); // values in b refer to this line
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}
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void g() {
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f(); // f's first argument corresponds to this line of code
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source_location c = source_location::current();
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f(c); // f's first argument gets the same values as c, above
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}
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```
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— *end example*]
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``` cpp
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constexpr source_location() noexcept;
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```
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The data members are initialized with valid but unspecified values.
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