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Definition

Defined in the standard header set, and in the nonstandard backward-compatibility header set.h.

Expression semantics

Name Expression Precondition Semantics Postcondition
Character assignment X::assign(c1, c2) Performs the assignment c1 = c2 X::eq(c1, c2) is true.
Character equality X::eq(c1, c2) Returns true if and only if c1 and c2 are equal.
Character comparison X::lt(c1, c2) Returns true if and only if c1 is less than c2 . Note that for any two value values c1 and c2 , exactly one of X::lt(c1, c2), X::lt(c2, c1) , and X::eq(c1, c2) should be true.
Range comparison X::compare(p1, p2, n) [p1, p1+n) and [p2, p2+n) are valid ranges. Generalization of strncmp. Returns 0 if every element in [p1, p1+n) is equal to the corresponding element in [p2, p2+n), a negative value if there exists an element in [p1, p1+n) less than the corresponding element in [p2, p2+n) and all previous elements are equal, and a positive value if there exists an element in [p1, p1+n) greater than the corresponding element in [p2, p2+n) and all previous elements are equal.
Length X::length(p) Generalization of strlen. Returns the smallest non-negative number n such that X::eq(p+n, X::char_type()) is true. Behavior is undefined if no such n exists.
Find X::find(p, n, c) [p, p+n) is a valid range. Generalization of strchr. Returns the first pointer q in [p, p+n) such that X::eq(*q, c) is true. Returns a null pointer if no such pointer exists. (Note that this method for indicating a failed search differs from that is find.)
Move X::move(s, p, n) [p, p+n) and [s, s+n) are valid ranges (possibly overlapping). Generalization of memmove. Copies values from the range [p, p+n) to the range [s, s+n), and returns s.
Copy X::copy(s, p, n) [p, p+n) and [s, s+n) are valid ranges which do not overlap. Generalization of memcpy. Copies values from the range [p, p+n) to the range [s, s+n), and returns s.
Range assignment X::assign(s, n, c) [s, s+n) is a valid range. Generalization of memset. Assigns the value c to each pointer in the range [s, s+n), and returns s.
EOF value X::eof() Returns a value that can represent EOF. X::eof() is distinct from every valid value of type X::char_type. That is, there exists no value c such that X::eq_int_type(X::to_int_type(c), X::eof()) is true.
Not EOF X::not_eof(e) Returns e if e represents a valid char_type value, and some non-EOF value if e is X::eof().
Convert to value type X::to_char_type(e) Converts e to X's int type. If e is a representation of some char_type value then it returns that value; if e is X::eof() then the return value is unspecified.
Convert to int type X::to_int_type(c) Converts c to X's int type. X::to_char_type(X::to_int_type(c)) is a null operation.
Equal int type values X::eq_int_type(e1, e2) Compares two int type values. If there exist values of type X::char_type such that e1 is X::to_int_type(c1)) and e2 is X::to_int_type(c2)), then X::eq_int_type(e1, e2) is the same as X::eq(c1, c2). Otherwise, eq_int_type returns true if e1 and e2 are both EOF and false if one of e1 and e2 is EOF and the other is not.


Example | Standard Template Library Programmer`s Guide | Template parameters







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