std::is_string_literal

consteval bool is_string_literal( const char* p );

consteval bool is_string_literal( const wchar_t* p );

consteval bool is_string_literal( const char8_t* p );

consteval bool is_string_literal( const char16_t* p );

consteval bool is_string_literal( const char32_t* p );

Determines if p points to an element of a string literal object.

The result is determined as follows:

• If p points to an object that is not usable in constant expressions, returns false.
• Otherwise, if p points to a subobject of a string literal object, returns true.
• Otherwise, returns false.

Parameters

Return value

true if p is statically determined to point into a string literal, false otherwise.

Example

#include <meta>

int main()
{
    constexpr const char* p = "";
    constexpr const char a[] = "";

    static_assert(std::is_string_literal(p));
    static_assert(!std::is_string_literal(a));
    static_assert(std::is_string_literal(LR"(wcahr_t)"));
    static_assert(std::is_string_literal(R"(\N{CAT})"));
}

See also