simstr::empty_expr< K > Struct Template Reference

An "empty" string expression. More...

#include <strexpr.h>

Detailed Description

template<typename K>
struct simstr::empty_expr< K >

An "empty" string expression.

Template Parameters

K	is a symbol.

A simple string expression that generates an empty string. Mainly used in the e_choice function when one of the branches should return an empty string. Either to start the addition operation of string expressions when the other operand is not a string expression, but there is an addition operator for it with string expressions. For convenience, constant objects of this type have already been defined for different types of symbols:

• eea for empty char string
• eew for empty string wchar_t
• eeu for empty string char16_t
• eeuu for empty string char32_t

Example:

result = shost + e_choice(sserv.is_empty(), eea, ":" + sserv);

result += "E" + e_choice(adjusted_exponent > 0, "+"_ss, eea) + adjusted_exponent;

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The documentation for this struct was generated from the following file:

• strexpr.h