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esp-compiler: add designated init macros to make esp configuration pattern viable under C++

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This commit is contained in:
David Cermak
2020-02-06 12:28:56 +01:00
parent d8da662dec
commit 50588ff3f7
3 changed files with 33 additions and 28 deletions
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18
components/esp_common/include/esp_compiler.h
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@@ -30,4 +30,22 @@
#define unlikely(x) (x)
#endif
/*
* Utility macros used for designated initializers, which work differently
* in C99 and C++ standards mainly for aggregate types.
* The member separator, comma, is already part of the macro, please omit the trailing comma.
* Usage example:
* struct config_t { char* pchr; char arr[SIZE]; } config = {
* ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(pchr)
* ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(arr, "Value")
* };
*/
#ifdef __cplusplus
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(member, value) { .member = value },
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(member) .member = { },
#else
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(member, value) .member = value,
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(member)
#endif
#endif