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[tab:format.sign]

28 Text processing library [text]

28.5 Formatting [format]

28.5.2 Format string [format.string]

28.5.2.2 Standard format specifiers [format.string.std]

Table 105 — Meaning of sign options [tab:format.sign]

Indicates that a sign should be used for both non-negative and negative numbers.

The + sign is inserted before the output of to_chars for non-negative numbers other than negative zero.

[Note 5:

For negative numbers and negative zero the output of to_chars will already contain the sign so no additional transformation is performed.

— end note]

Indicates that a sign should be used for negative numbers and negative zero only (this is the default behavior).

Indicates that a leading space should be used for non-negative numbers other than negative zero, and a minus sign for negative numbers and negative zero.