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Silence memset warning. (#3505)

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Compiling the code as-is results in the following warning:

-->8--
imgui_freetype.cpp:341:72: warning: ‘void* memset(void*, int, size_t)’
        clearing an object of type ‘struct ImFontBuildSrcDataFT’ with no
        trivial copy-assignment; use assignment or value-initialization
        instead [-Wclass-memaccess]
  341 |     memset(src_tmp_array.Data, 0, (size_t)src_tmp_array.size_in_bytes());
      |                                                                        ^
imgui_freetype.cpp:302:8: note: ‘struct ImFontBuildSrcDataFT’ declared here
  302 | struct ImFontBuildSrcDataFT
      |        ^~~~~~~~~~~~~~~~~~~~
--8<--

This is caused by presence of ImVector<> directly in ImFontBuildSrcDataFT data
structure, as well as in the child ImBitVector. Since ImVector<> has a
constructor, the compiler infers that initialization by memset is not valid.
Such initialization is not a bug, however, as the default ImVector<> ctor just
sets the structure data members to 0, which is exactly what the memset does.

Casting the data structure address to void* pointer silences this warning.
This commit is contained in:
Bartosz Taudul 2020-10-02 19:12:53 +02:00 committed by GitHub
parent 7b1ab5b275
commit 6469b94304
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1 changed files with 2 additions and 2 deletions
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4
misc/freetype/imgui_freetype.cpp
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@ -338,8 +338,8 @@ bool ImFontAtlasBuildWithFreeType(FT_Library ft_library, ImFontAtlas* atlas, uns
ImVector<ImFontBuildDstDataFT> dst_tmp_array;
src_tmp_array.resize(atlas->ConfigData.Size);
dst_tmp_array.resize(atlas->Fonts.Size);
memset(src_tmp_array.Data, 0, (size_t)src_tmp_array.size_in_bytes());
memset(dst_tmp_array.Data, 0, (size_t)dst_tmp_array.size_in_bytes());
memset((void*)src_tmp_array.Data, 0, (size_t)src_tmp_array.size_in_bytes());
memset((void*)dst_tmp_array.Data, 0, (size_t)dst_tmp_array.size_in_bytes());
// 1. Initialize font loading structure, check font data validity
for (int src_i = 0; src_i < atlas->ConfigData.Size; src_i++)