A compound literal is an lvalue and values of its elements are modifiable. In case of char* str = (char[]){“Hello World”}; *str=”B”; // A-Okay! you are modifying a compound literal which is legal. C11-ยง6.5.2.5/4: If the type name specifies an array of unknown size, the size is determined by the initializer list as specified in … Read more
Short answer: You need to make use of a compound literal. Something like arrayfn( (double[]) {1.0, 2.0, 3.0} ); should do the job. Some explanation Coming to the part, why arrayfn({1.0, 2.0, 3.0}); did not work, because, without the syntax for compound literals, {1.0, 2.0, 3.0} is a brace enclosed initializer list. It does not … Read more
C99 C11 introduced compound literals which allow not only a complicated initialized structure, but also an “in-line” variable. Code can call a conversion function and pass in a new buffer (char [UTOA_BASE_N]){0} per each function call allowing the function to return that same buffer, now written as needed that is still within its lifetime. The … Read more
This is an extension that both gcc and clang support. The gcc document says: As an extension, GCC supports compound literals in C90 mode and in C++, though the semantics are somewhat different in C++. if you build with -pedantic you should receive a warning, for example clang says (see it live): warning: compound literals … Read more