toy::StringLike Concept Reference

Concept satisfied when T exposes size() as size_t and c_str() as a pointer to null-terminated characters. More...

Concept definition

template<typename T>
concept StringLike = requires(const T & str) {
  { str.size() } -> std::same_as<size_t>;
  { str.c_str() } -> std::convertible_to<const char *>;
}

Detailed Description

Concept satisfied when T exposes size() as size_t and c_str() as a pointer to null-terminated characters.

This concept defines the interface that any type must satisfy to be considered string-like. It requires the type to have a size() method that returns a value convertible to size_t, and a c_str() method that returns a value convertible to const char*.

Requirements

A type T satisfies StringLike if and only if:

• T::size() returns size_t (std::same_as<size_t>).
• T::c_str() returns std::convertible_to<const char *>.

Usage Example

#include "core.hpp"
 
std::string stdStr = "Hello";
static_assert(StringLike<decltype(stdStr)>);
 
constexpr toy::CStringView view("Hi");
static_assert(StringLike<decltype(view)>);
 
toy::FixedString<32> fixedStr = "World";
static_assert(StringLike<decltype(fixedStr)>);
 
toy::FixedString<64> result;
result.assign(stdStr);
result += fixedStr;

Note

std::string, toy::CStringView, and toy::FixedString are typical representatives; other types qualify if they match the expression requirements above.

See also

toy::CStringView, toy::FixedString